#include <iostream>
#include <string>
using namespace std;

string DecToSystem(int number,int system)
{
    if (number == 0)
        return "";
    else
    {
        int digit = number % system;
        return DecToSystem(number / system, system) + to_string(digit);
    }
}

int main()
{
    int key;
    cin >> key;
    string message;
    cin >> message;
    int codeResult = 0;
    for (int i = 0; i < message.length() ; i++)
    {
        int code;
        if (message[i] >= 'a' && message[i] <= 'z')
            code = (int)message[i]-96;
        else if (message[i] >= 'A' && message[i] <= 'Z')
            code = (int)message[i]-64;
        else
            code = (int)message[i];
        codeResult += code;
    }
    cout << key << message.length() << DecToSystem(codeResult, key);
    return 0;
}