5. Messages

using System;

namespace _05_Messages
{
    class Program
    {
        static void Main(string[] args)
        {
            int countOfLetters = int.Parse(Console.ReadLine());
            string word = string.Empty;

            for (int i = 1; i <= countOfLetters; i++)
            {
                string currentDigits = Console.ReadLine();

                switch (currentDigits)
                {
                    case "2":
                        word += 'a';
                        break;
                    case "22":
                        word += 'b';
                        break;
                    case "222":
                        word += 'c';
                        break;

                    case "3":
                        word += 'd';
                        break;
                    case "33":
                        word += 'e';
                        break;
                    case "333":
                        word += 'f';
                        break;


                    case "4":
                        word += 'g';
                        break;
                    case "44":
                        word += 'h';
                        break;
                    case "444":
                        word += 'i';
                        break;


                    case "5":
                        word += 'j';
                        break;
                    case "55":
                        word += 'k';
                        break;
                    case "555":
                        word += 'l';
                        break;

                    case "6":
                        word += 'm';
                        break;
                    case "66":
                        word += 'm';
                        break;
                    case "666":
                        word += 'o';
                        break;

                    case "7":
                        word += 'p';
                        break;
                    case "77":
                        word += 'q';
                        break;
                    case "777":
                        word += 'r';
                        break;
                    case "7777":
                        word += 's';
                        break;

                    case "8":
                        word += 't';
                        break;
                    case "88":
                        word += 'u';
                        break;
                    case "888":
                        word += 'v';
                        break;

                    case "9":
                        word += 'w';
                        break;
                    case "99":
                        word += 'x';
                        break;
                    case "999":
                        word += 'y';
                        break;
                    case "9999":
                        word += 'z';
                        break;

                    case "0":
                        word += ' ';
                        break;



                }
            }
            Console.WriteLine(word);
        }
    }
}