using System;

namespace _05._Messages
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int komands = int.Parse(Console.ReadLine());
            string text = "";
            int count = 0;

            for (int i = 0; i < komands; i++)
            {
                int number = int.Parse(Console.ReadLine());

                int symbol = number % 10;

                if (symbol == 0)
                {
                    text += " ";
                }
                else if (symbol == 2)
                {
                    while (number > 0)
                    {
                        number /= 10;
                        count++;
                    }
                    if (count == 1) { text += "a"; }
                    else if (count == 2) { text += "b"; }
                    else if (count == 3) { text += "c"; }
                    count = 0;
                }
                else if (symbol == 3)
                {
                    while (number > 0)
                    {
                        number /= 10;
                        count++;
                    }
                    if (count == 1) { text += "d"; }
                    else if (count == 2) { text += "e"; }
                    else if (count == 3) { text += "f"; }
                    count = 0;
                }
                else if (symbol == 4)
                {
                    while (number > 0)
                    {
                        number /= 10;
                        count++;
                    }
                    if (count == 1) { text += "g"; }
                    else if (count == 2) { text += "h"; }
                    else if (count == 3) { text += "i"; }
                    count = 0;
                }
                else if (symbol == 5)
                {
                    while (number > 0)
                    {
                        number /= 10;
                        count++;
                    }
                    if (count == 1) { text += "j"; }
                    else if (count == 2) { text += "k"; }
                    else if (count == 3) { text += "l"; }
                    count = 0;
                }
                else if (symbol == 6)
                {
                    while (number > 0)
                    {
                        number /= 10;
                        count++;
                    }
                    if (count == 1) { text += "m"; }
                    else if (count == 2) { text += "n"; }
                    else if (count == 3) { text += "o"; }
                    count = 0;
                }
                else if (symbol == 7)
                {
                    while (number > 0)
                    {
                        number /= 10;
                        count++;
                    }
                    if (count == 1) { text += "p"; }
                    else if (count == 2) { text += "q"; }
                    else if (count == 3) { text += "r"; }
                    else if (count == 4) { text += "s"; }
                    count = 0;
                }
                else if (symbol == 8 )
                {
                    while (number > 0)
                    {
                        number /= 10;
                        count++;
                    }
                    if (count == 1) { text += "t"; }
                    else if (count == 2) { text += "u"; }
                    else if (count == 3) { text += "v"; }
                    count = 0;
                }
                else if (symbol == 9)
                {
                    while (number > 0)
                    {
                        number /= 10;
                        count++;
                    }
                    if (count == 1) { text += "w"; }
                    else if (count == 2) { text += "x"; }
                    else if (count == 3) { text += "y"; }
                    else if (count == 4) { text += "z"; }
                    count = 0;
                }
            }
            Console.WriteLine(text);
        }
    }
}