using System; 
using System.Collections.Generic;
using System.Collections;  // For old-style ArrayList. 
 
class StackSample 
{ 
    static void Main(string[] args) 
    { 
        Stack kpopStack = new Stack(); 
 
        kpopStack.Push("BLACKPINK");
        kpopStack.Push("Kiss of Life");
        kpopStack.Push("Stray Kids");
        kpopStack.Push("BABYMONSTER");
        kpopStack.Push("TREASURE");
        kpopStack.Push("?? Caddy Shack II ??");  // Oops, wrong concert...
 
        kpopStack.Pop();  // Remove the mistaken entry
        kpopStack.Push("LE SSERAFIM"); // Added a correct K-pop group
 
        Console.WriteLine("My Favorite KPop Group Performances Stack:");
 
        foreach (string group in kpopStack) 
        { 
            Console.WriteLine(group); 
        }
 
        Console.WriteLine("\n\nReplaying Performances in Reverse Order...\n"); 
 
        while (kpopStack.Count > 0) 
        { 
            string group = (string)kpopStack.Pop(); 
            Console.WriteLine("Replaying {0}", group); 
        } 
    } 
}

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