Messages

using System;

namespace P05_Messages
{
    class Program
    {
        static void Main(string[] args)
        {
            int tapTimes = int.Parse(Console.ReadLine());
            string message = "";

            for (int i = 1; i <= tapTimes; i++)
            {
                int input = int.Parse(Console.ReadLine());
                int lenght = input.ToString().Length;
                int mainDigit = input % 10;
                int offset = (mainDigit - 2) * 3;

                if(mainDigit==8 || mainDigit==9)
                {
                    offset += 1;
                }
                int indexLetter = offset + lenght - 1;

                if(mainDigit != 0)
                {
                    message += (char)(indexLetter + 97);
                }
                else
                {
                    message += (char)(32);
                }
            }
            Console.WriteLine(message);
        }
    }
}