#include <cstdio>
#include <cstring>

char radix[13] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C'};

int main(int argc, char *argv[]) {
    int r, g, b;
    scanf("%d %d %d", &r, &g, &b);
    printf("#");
    printf("%c%c", radix[r/13], radix[r%13]);
    printf("%c%c", radix[g/13], radix[g%13]);
    printf("%c%c", radix[b/13], radix[b%13]);
    return 0;
}