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

int main () {
	string p[10] = {"BNZ", "CIP", "DOQ", "ER", "FS", "GT", "HU", "JVX", "KLY", "AMW"};
	int id, c, w;
	while (cin >> id) {
		c = id % 10;
		for (w=1; id/=10; w++)
			c += id % 10 * w;
		cout << p[c%10] << endl;
	}
}