#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;
}