using System;
using System.Collections.Generic;
using System.Text;

namespace SMSTyping
{
    class Program
    {
        static void Main()
        {
            Dictionary<int, string> decoder = CreateKeyboardDecoder();

            var n = int.Parse(Console.ReadLine());
            var sb = new StringBuilder();
            for (int i = 0; i < n; i++)
            {
                var input = int.Parse(Console.ReadLine());
                sb.Append(decoder[input]);
            }
            Console.WriteLine(sb.ToString());
        }

        private static Dictionary<int, string> CreateKeyboardDecoder()
        {
            var decoder = new Dictionary<int, string>();
            int number = 0;
            int k = 0;
            for (int j = 2; j < 10; j++)
            {
                for (int i = 1; i <= 1000; i *= 10)
                {
                    number += i * j;
                    decoder.Add(number, ((char)('a' + k)).ToString());
                    k++;
                    if (j != 7 && j != 9 && i == 100)
                    {
                        break;
                    }
                }
                number = 0;
            }
            decoder.Add(0, " ");
            decoder.Add(1, "");
            return decoder;
        }
    }
}