Login

void Main()
{
    string username = Console.ReadLine();
    string password = "";
    string userInput = "";
    for(int i = username.Length-1;i >= 0;i--)
    {
        password += username[i];
    }
    int counter = 0;

    while((userInput = Console.ReadLine())  != password)
    {
        if(userInput != password)
        {

            if(counter == 3)
            {
                Console.WriteLine($"User {username} blocked!");
                return;
            }
            Console.WriteLine("Login not successful! Incorrect password!Try again!");
            counter++;
        }


    }

    if(userInput == password)
        {
            Console.WriteLine($"User {username} logged in.");

        }
}