using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Numerics;

namespace podgotovka1vazada4a
{
    class Program
    {
        static BigInteger MeowToDec(string meow)
        {

            BigInteger sum = 0;

            foreach (char digit in meow)
            {
                sum = (digit - 'a') + sum * 21;
            }

            return sum;

        }
        static string DecimalToMeow(BigInteger decValue)
        {

            string result = string.Empty;

            do
            {
                char digit = (char)('a' + (decValue % 26));
                result = digit + result;
                decValue /= 26;

            } while (decValue > 0);

            return result;
        }

        static void Main(string[] args)
        {
            var input = Console.ReadLine().Split(' ').Select(MeowToDec).ToArray();


            foreach (var word in input)
            {
                var asnwer = DecimalToMeow(word);
                Console.Write(asnwer + " ");
            }

        }
    }
}