02.SpyHadr

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


    class Program
    {
        static void Main(string[] args)
        {
            int numeralSystem = int.Parse(Console.ReadLine());

            string input = Console.ReadLine();

            int totalValue = 0;
           string convertedValue = "";

            for (int i = 0; i < input.Length; i++)
            {
                if (input[i] >= 'A' && input[i] <= 'Z' )
                {
                    totalValue += input[i] - 64;
                }
                else if (input[i] >= 'a' & input[i] <= 'z' )
                {
                    totalValue += input[i] - 96;
                }
                else
                {
                    totalValue += input[i];
                }
            }
            do
            {
                convertedValue = (totalValue % numeralSystem) + convertedValue;
                totalValue /= numeralSystem;
            }
            while (totalValue != 0);
            Console.WriteLine(numeralSystem.ToString()+input.Length + convertedValue);
        }
    }