using System;

namespace _04_PasswordValidator
{
    class Program
    {
        static void Main(string[] args)
        {
            string password = Console.ReadLine();
            bool isValid = true;

            isValid = PasswordLenght(password, isValid);
            isValid = OnlyLettersAndDigits(password, isValid);
            isValid = lastTwoCharecter(password, isValid);
            if (isValid)
            {
                Console.WriteLine("Password is valid");
            }
        }

        static bool PasswordLenght(string input, bool isValid)
        {

            if (input.Length < 6 || input.Length > 10)
            {
                isValid = false;
                Console.WriteLine("Password must be between 6 and 10 characters");

            }
            return isValid;
        }
        static bool lastTwoCharecter(string input, bool isValid)
        {
            int inputLenght = input.Length;
            int lastCharecter = input[inputLenght - 1];
            int beforLastChar = input[inputLenght - 2];
            if (57 < lastCharecter || lastCharecter < 48 || 57 < beforLastChar || beforLastChar < 48)
            {
                isValid = false;
                Console.WriteLine("Password must have at least 2 digits");
            }
            return isValid;
        }
        static bool OnlyLettersAndDigits(string input, bool isValid)
        {
            bool isNotValid = false;
            for (int i = 0; i < input.Length; i++)
            {
                int number = input[i];
                if (number < 48 || 57 < number && number < 65 || 90 < number && number < 97 || 122 < number)
                {
                    isNotValid = true;
                }
            }
            if (isNotValid)
            {
                isValid = false;
                Console.WriteLine("Password must consist only of letters and digits");
            }
            return isValid;
        }
    }
}