#include <stdio.h>

int main(void)
{
    long long A, B;
    scanf("%ld %ld", &A, &B);
    if (A * 1000 > B * 3600)
        printf("KoD\n");
    else if (A * 1000 == B * 3600)
        printf("same\n");
    else
        printf("blackyuki\n");
    return 0;
}