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

namespace P04PasswordValidator
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();

            if (PasswordCheckerFirstRule(input)==false)
            {
                Console.WriteLine("Password must be between 6 and 10 characters");
            }
            if (PasswordCheckerSecondRule(input)==false)
            {
                Console.WriteLine("Password must consist only of letters and digits");
            }
            if (PasswordCheckerThirdRule(input)==false)
            {
                Console.WriteLine("Password must have at least 2 digits");
            }

            if (PasswordCheckerFirstRule(input) == true
                && PasswordCheckerSecondRule(input) == true
                && PasswordCheckerThirdRule(input) == true)
            {
                Console.WriteLine("Password is valid");
            }

        }

        static bool PasswordCheckerFirstRule(string password)
        {

            bool isBetween6and10=true;
            if(password.Length < 6 || password.Length > 10)
            {
                isBetween6and10 = false;
            }
            return isBetween6and10;
        }

        static bool PasswordCheckerSecondRule(string password)
        {
            bool onlyLettersAndNumbers = true;

            for (int i = 0; i < password.Length; i++)
            {
                if (((int)password[i] < 48) ||
                    ( (int)password[i] > 57 && (int)password[i] < 65 ||
                    (int)password[i] > 90) && (int)password[i] < 97 ||
                    (int)password[i] > 122)
                {
                    onlyLettersAndNumbers = false;
                }

            }

            return onlyLettersAndNumbers;

        }

        static bool PasswordCheckerThirdRule(string password)
        {
            bool digitsCount = false;
            bool areDigitsCount2 = false;
            char[] digits = new char[password.Length];
            int count = 0;

            for(int i = 0; i < password.Length; i++)
            {
                digits[i] = password[i];
                digitsCount= "0123456789".IndexOf(digits[i]) >= 0;
                if (digitsCount)
                {
                    count++;
                }
            }

            if (count >= 2)
            {
                areDigitsCount2 = true;
            }

            return areDigitsCount2;
        }


    }
}