using System;

namespace strong_number
{
    class Program
    {
        static void Main()
        {
            string password = Console.ReadLine();

            int NumsCount = 0;
            int NonLetters = 0;
            if (password.Length >= 6 & password.Length <= 10)
            {

            }
            else
            {
                Console.WriteLine("Password must be between 6 and 10 characters");
            }
            char[] all = password.ToCharArray();
            for (int i = 0; i < all.Length; i++)
            {
                if (char.IsLetter(all[i])) { } else { NonLetters++; }
                if (char.IsDigit(all[i])) { NumsCount++; }
            }
            if (NonLetters > 1 & NumsCount == 0)
            {
                Console.WriteLine("Password must consist only of letters and digits");
            }
            if (NumsCount >= 2)
            {
                Console.WriteLine("Password is valid");
            }
            else
            {
                Console.WriteLine("Password must have at least 2 digits");
            }
        }

    }
}