5. Login

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp76
{
    class Program
    {
        static void Main(string[] args)
        {
            char[] user = Console.ReadLine().ToCharArray();
            char[] password = user.Reverse().ToArray();
            int count = 0;

            while (true)
            {

                char[] input = Console.ReadLine().ToCharArray();

                for (int i = 0; i <= user.Length - 1; i++)
                {
                    if (input[i] == password[i])
                    {
                        Console.WriteLine($"User {string.Join("",user)} logged in.");
                        break;
                    }
                    else
                    {
                        count++;
                        if (count > 3)
                        {
                            Console.WriteLine("User sunny blocked!");
                            break;
                        }
                        else
                        {
                            Console.WriteLine("Incorrect password. Try again.");
                            break;
                        }
                    }
                }
            }
        }
    }
}