using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        //Stack<> for push and pop element

        var names=new Stack<string>();

        names.Push("Sai");

        names.Push("Pavan");

        names.Push("Baba");

        foreach(var n in names)

        {

            Console.WriteLine(n);

        }

        Console.WriteLine("Peek element:"+names.Peek());

        Console.WriteLine("Pop element:"+names.Pop());

        Console.WriteLine("After pop,peek element:"+names.Peek());

    }

}