diff --git a/.idea/codeStyles/codeStyleConfig.xml b/.idea/codeStyles/codeStyleConfig.xml
index 79ee123c..6e6eec11 100644
--- a/.idea/codeStyles/codeStyleConfig.xml
+++ b/.idea/codeStyles/codeStyleConfig.xml
@@ -1,5 +1,6 @@
 <component name="ProjectCodeStyleConfiguration">
   <state>
     <option name="USE_PER_PROJECT_SETTINGS" value="true" />
+    <option name="PREFERRED_PROJECT_CODE_STYLE" value="Default" />
   </state>
 </component>
\ No newline at end of file
diff --git a/app/src/main/java/com/github/braillesystems/learnbraille/ui/Messages.kt b/app/src/main/java/com/github/braillesystems/learnbraille/ui/Messages.kt
index 6e9626c9..adb80996 100644
--- a/app/src/main/java/com/github/braillesystems/learnbraille/ui/Messages.kt
+++ b/app/src/main/java/com/github/braillesystems/learnbraille/ui/Messages.kt
@@ -1,7 +1,12 @@
 package com.github.braillesystems.learnbraille.ui
 
 import android.content.Context
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.appcompat.app.AlertDialog
 import androidx.fragment.app.Fragment
+import androidx.fragment.app.FragmentActivity
 import com.github.braillesystems.learnbraille.R
 import com.github.braillesystems.learnbraille.data.entities.*
 import com.github.braillesystems.learnbraille.res.inputMarkerPrintRules
@@ -10,6 +15,7 @@ import com.github.braillesystems.learnbraille.res.showMarkerPrintRules
 import com.github.braillesystems.learnbraille.res.showSymbolPrintRules
 import com.github.braillesystems.learnbraille.ui.views.BrailleDotsViewMode
 import com.github.braillesystems.learnbraille.utils.*
+import kotlinx.android.synthetic.main.fragment_flip_dialog.view.*
 
 fun Fragment.showCorrectToast() = toast(getString(R.string.input_correct))
 
@@ -63,3 +69,19 @@ fun Context.showPrint(data: MaterialData): String =
 
 fun Fragment.showPrint(data: MaterialData): String =
     contextNotNull.showPrint(data)
+
+fun FragmentActivity.showFlipPreferenceDialog() {
+    val viewGroup: ViewGroup = findViewById(android.R.id.content)
+    val dialogView: View =
+        LayoutInflater.from(this).inflate(R.layout.fragment_flip_dialog, viewGroup, false)
+    val builder: AlertDialog.Builder = AlertDialog.Builder(this)
+    builder.setView(dialogView)
+    builder.setTitle(getString(R.string.fragment_flip_dialog_title))
+    val alertDialog: AlertDialog = builder.create()
+    alertDialog.show()
+    dialogView.btnOK.setOnClickListener {
+        val flipPreferenceOn = dialogView.radioButtonFlip.isChecked
+        // TODO save preference & never ask again
+        alertDialog.hide()
+    }
+}
diff --git a/app/src/main/java/com/github/braillesystems/learnbraille/ui/screens/menu/MenuFragment.kt b/app/src/main/java/com/github/braillesystems/learnbraille/ui/screens/menu/MenuFragment.kt
index 5a9e2ae9..0e99e687 100644
--- a/app/src/main/java/com/github/braillesystems/learnbraille/ui/screens/menu/MenuFragment.kt
+++ b/app/src/main/java/com/github/braillesystems/learnbraille/ui/screens/menu/MenuFragment.kt
@@ -15,11 +15,13 @@ import com.github.braillesystems.learnbraille.data.db.LearnBrailleDatabase
 import com.github.braillesystems.learnbraille.databinding.FragmentMenuBinding
 import com.github.braillesystems.learnbraille.ui.screens.AbstractFragmentWithHelp
 import com.github.braillesystems.learnbraille.ui.screens.theory.toLastCourseStep
+import com.github.braillesystems.learnbraille.ui.showFlipPreferenceDialog
 import com.github.braillesystems.learnbraille.utils.*
 import com.google.android.material.button.MaterialButton
 import org.koin.android.ext.android.inject
 import timber.log.Timber
 
+
 class MenuFragment : AbstractFragmentWithHelp(R.string.menu_help) {
 
     private val db: LearnBrailleDatabase by inject()
@@ -97,6 +99,7 @@ class MenuFragment : AbstractFragmentWithHelp(R.string.menu_help) {
         }
 
         colorButtons(buttons)
+        activity?.showFlipPreferenceDialog() // TODO ask in practice and theory
 
     }.root
 
diff --git a/app/src/main/res/layout/fragment_flip_dialog.xml b/app/src/main/res/layout/fragment_flip_dialog.xml
new file mode 100644
index 00000000..5835e6c8
--- /dev/null
+++ b/app/src/main/res/layout/fragment_flip_dialog.xml
@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/fragment_flip_dialog"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+    <!-- TODO reduce hardcode -->
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text="@string/fragment_flip_dialog_msg"
+        android:layout_margin="10dp"
+        android:textSize="@dimen/lessons_info_text_size"/>
+
+    <RadioGroup
+        android:id="@+id/radioGroup"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_margin="10dp">
+
+        <RadioButton
+            android:id="@+id/radioButtonNoFlip"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/radio_btn_no_flip"
+            android:checked="true"
+            android:textAlignment="center" />
+
+        <RadioButton
+            android:id="@+id/radioButtonFlip"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/radio_btn_flip"
+            android:textAlignment="center" />
+    </RadioGroup>
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:layout_margin="10dp"
+        android:text="@string/fragment_flip_dialog_msg2"
+        android:textSize="@dimen/lessons_info_text_size"/>
+
+    <Button
+        android:id="@+id/btnOK"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:layout_margin="10dp"
+        android:text="@string/dialog_ok" />
+</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 4c2357f1..3670052c 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -549,4 +549,16 @@
     <string name="stats_section_7days">За последние 7 дней</string>
     <string name="stats_section_30days">За последние 30 дней</string>
     <string name="flip_card">Шеститочие: письмо/чтение</string>
+
+    <string name="fragment_flip_dialog_title">Выберите порядок столбцов в шеститочии</string>
+    <string name="fragment_flip_dialog_msg">
+        Выберите удобный Вам вариант расположения точек <b>при вводе</b>.
+    </string>
+    <string name="fragment_flip_dialog_msg2">
+        Вы всегда сможете изменить это значение в разделе \"Настройки\"/
+        \"Порядок столбцов при вводе\"
+    </string>
+    <string name="dialog_ok">OK</string>
+    <string name="radio_btn_flip">Точки 1, 2, 3 справа (как при письме на брайлевском приборе)</string>
+    <string name="radio_btn_no_flip">Точки 1, 2, 3 слева (как при чтении)</string>
 </resources>