using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Without usage of IDE predict the output:");

​

        try

        {

            ICollection<char> chars = "Easy peasy".ToArray();

            chars.Add('!');

            Console.WriteLine(string.Join("", chars));

        }

        catch

        {

            Console.WriteLine("Yes yes!");

        }

    }

}