using System;
using System.Text;

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

            if (LengthPass(password) == false)
            {
                Console.WriteLine("Password must be between 6 and 10 characters");
            }

            if (CheckedLettersAndDigits(password) == false)
            {
                Console.WriteLine("Password must consist only of letters and digits");
            }

            if (CheckedLeastDigits(password) == false)
            {
                Console.WriteLine("Password must have at least 2 digits");
            }

            if (LengthPass(password) == true && CheckedLettersAndDigits(password) == true && CheckedLeastDigits(password) == true)
            {
                Console.WriteLine("Password is valid");
            }

        }

        static bool LengthPass(string password)
        {

            bool result = false;

            if (password.Length >= 6 && password.Length <= 10)
            {
                result = true;
            }

            return result;
        }

        static bool CheckedLettersAndDigits(string password)
        {
            bool result = true;


            for (int i = 0; i < password.Length; i++)
            {

                bool isDigits = true;      // ASCII - 48 - 57;
                bool isUpperLetters = true;  // ASCII - 65 - 90;
                bool isLowerLetters = true;  // ASCII  - 97 - 122;

                for (int num = 48; num <= 57; num++)
                {
                    char currentNum = (char)num;

                    if (currentNum == password[i])
                    {
                        isDigits = true;
                        break;
                    }
                    else
                    {
                        isDigits = false;
                    }
                }

                for (int upperL = 65; upperL <= 90; upperL++)
                {
                    char upperLet = (char)upperL;

                    if (upperL == password[i])
                    {
                        isUpperLetters = true;
                        break;
                    }
                    else
                    {
                        isUpperLetters = false;
                    }
                }

                for (int lowerL = 97; lowerL <= 122; lowerL++)
                {

                    char lowerLet = (char)lowerL;

                    if (lowerLet == password[i])
                    {
                        isLowerLetters = true;
                        break;
                    }
                    else
                    {
                        isLowerLetters = false;
                    }
                }

                if ((isDigits == false) && (isUpperLetters == false) && (isLowerLetters == false))
                {
                    result = false;
                    break;
                }
            }

            return result;
        }

        static bool CheckedLeastDigits(string password)
        {
            bool result = true;
            int digitsCounter = 0;

            for (int i = 0; i < password.Length; i++)
            {
                for (int digs = 48; digs <= 57; digs++)
                {
                    char digits = (char)digs;

                    if (digits == password[i])
                    {
                        digitsCounter++;
                    }
                }
            }

            if (digitsCounter < 2)
            {
                result = false;
            }

            return result;
        }

    }
}