using System;
using ClassExamples;

class Test
{
    static void Main(string[] args)
    {
        Stack<int> stack = new Stack<int>();
        stack.Push(1);
        stack.Push(2);
        stack.Push(3);

        //what is the output?
        Console.WriteLine(stack.Pop());
        Console.WriteLine(stack.Pop());
        Console.WriteLine(stack.Pop());
    }
}