Messages

using System;
using System.Text;

namespace FundamentalsIntro
{
    public class Program
    {
        public static void Main()
        {
            //Write a program, which emulates typing an SMS
            int number = int.Parse(Console.ReadLine());
            string letter = string.Empty;
            string message = string.Empty;

            for (int i = 1; i <= number; i++)
            {
                string index = Console.ReadLine();
                int button = int.Parse(index);
                int sumOfIndex = 0;

                if(button % 10 == 2)
                {
                    for (int a = 0; a < index.Length ; a++)
                    {
                        sumOfIndex += a;
                    }

                    if(sumOfIndex == 0)
                    {
                        letter = "a";
                    }
                    else if(sumOfIndex == 1)
                    {
                        letter = "b";
                    }
                    else if(sumOfIndex == 3)
                    {
                        letter = "c";
                    }
                }
                else if(button % 10 == 3)
                {
                    for (int a = 0; a < index.Length ; a++)
                    {
                        sumOfIndex += a;
                    }
                    if(sumOfIndex == 0)
                    {
                        letter = "d";
                    }
                    else if(sumOfIndex == 1)
                    {
                        letter = "e";
                    }
                    else if(sumOfIndex == 3)
                    {
                        letter = "f";
                    }
                }
                else if(button % 10 == 4)
                {
                    for (int a = 0; a < index.Length ; a++)
                    {
                        sumOfIndex += a;
                    }
                    if(sumOfIndex == 0)
                    {
                        letter = "g";
                    }
                    else if(sumOfIndex == 1)
                    {
                        letter = "h";
                    }
                    else if(sumOfIndex == 3)
                    {
                        letter = "i";
                    }
                }
                else if(button % 10 == 5)
                {
                    for (int a = 0; a < index.Length ; a++)
                    {
                        sumOfIndex += a;
                    }
                    if(sumOfIndex == 0)
                    {
                        letter = "j";
                    }
                    else if(sumOfIndex == 1)
                    {
                        letter = "k";
                    }
                    else if(sumOfIndex == 3)
                    {
                        letter = "l";
                    }
                }
                else if(button % 10 == 6)
                {
                    for (int a = 0; a < index.Length ; a++)
                    {
                        sumOfIndex += a;
                    }
                    if(sumOfIndex == 0)
                    {
                        letter = "m";
                    }
                    else if(sumOfIndex == 1)
                    {
                        letter = "n";
                    }
                    else if(sumOfIndex == 3)
                    {
                        letter = "o";
                    }
                }
                else if(button % 10 == 7)
                {
                    for (int a = 0; a < index.Length ; a++)
                    {
                        sumOfIndex += a;
                    }
                    if(sumOfIndex == 0)
                    {
                        letter = "p";
                    }
                    else if(sumOfIndex == 1)
                    {
                        letter = "q";
                    }
                    else if(sumOfIndex == 3)
                    {
                        letter = "r";
                    }
                    else if(sumOfIndex == 9)
                    {
                        letter = "s";
                    }
                }
                else if(button % 10 == 8)
                {
                    for (int a = 0; a < index.Length ; a++)
                    {
                        sumOfIndex += a;
                    }
                    if(sumOfIndex == 0)
                    {
                        letter = "t";
                    }
                    else if(sumOfIndex == 1)
                    {
                        letter = "u";
                    }
                    else if(sumOfIndex == 3)
                    {
                        letter = "v";
                    }
                }
                else if(button % 10 == 9)
                {
                    for (int a = 0; a < index.Length ; a++)
                    {
                        sumOfIndex += a;
                    }
                    if(sumOfIndex == 0)
                    {
                        letter = "w";
                    }
                    else if(sumOfIndex == 1)
                    {
                        letter = "x";
                    }
                    else if(sumOfIndex == 3)
                    {
                        letter = "y";
                    }
                    else if(sumOfIndex == 9)
                    {
                        letter = "z";
                    }
                }
                else if(button % 10 == 0)
                {
                    letter = " ";
                }

                message += letter;
            }

            Console.WriteLine(message);
        }

    }
}