using System;

namespace PasswordValidator
{
    class Program
    {
        static void Main(string[] args)
        {
            string password = Console.ReadLine();

            int countOfNumbers = 0;
            int countOfChecks = 0;
            bool isCheckForSize = true;
            bool isCheckForLetters = false;

            if (password.Length < 6 || password.Length > 10) // проверка за дължината на паролата
            {
                Console.WriteLine("Password must be between 6 and 10 characters");
                isCheckForSize = false;
            }

            for (int i = 0; i < password.Length; i++)
            {
                char currentLetter = password[i];

                if (currentLetter >= 48 && currentLetter <= 57) // проверка за цифри в паролата
                {
                    countOfNumbers++;
                }

                if ((currentLetter >= 32 && currentLetter <= 47) || (currentLetter >= 58 && currentLetter <= 64) || (currentLetter >= 91 && currentLetter <= 96) || (currentLetter >= 123)) // проверка за други символи
                {
                    if (countOfChecks == 1)
                    {
                        continue;
                    }
                    Console.WriteLine("Password must consist only of letters and digits");
                    countOfChecks++;
                }
                if ((currentLetter >= 65 && currentLetter <= 90) || (currentLetter >= 97 && currentLetter <= 122)) // проверка за букви
                {
                    isCheckForLetters = true;
                }
            }
            if (countOfNumbers < 2)
            {
                Console.WriteLine("Password must have at least 2 digits");
            }
            if (isCheckForLetters == false)
            {
                if (countOfChecks == 0)
                {
                    Console.WriteLine("Password must consist only of letters and digits");
                }
            }
            if (isCheckForSize && countOfChecks == 0 && isCheckForLetters && countOfNumbers >= 2)
            {
                Console.WriteLine("Password is valid");
            }
        }
    }
}