the moon.md

import java.util.Stack;

public class Solution { Stack stack1 = new Stack(); Stack stack2 = new Stack();

public void push(int node) {
    while(!stack2.isEmpty())
    {
        stack1.push(stack2.pop());
    }
    stack1.push(node);
    while(!stack1.isEmpty())
    {
        stack2.push(stack1.pop());
    }
}

public int pop() {
   return stack2.pop();
}

}