C++ :

#include <bits/stdc++.h>
using namespace std;

int main() {
	string s;
	int m;
	
	while (cin >> s >> m) {
		int res = 0, base = 1;
		for (int i = s.size() - 1; i >= 0; i --) {
			res += (s[i] - '0') * base % m;
			res %= m;
			base = base * 10 % m;
		}
		cout << res << endl;
	}

	return 0;
}