#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,m,n) for(int i=m; i<n; ++i)
#define repl(i,m,n) for(ll i=m; i<n; ++i)

int main(){
    ll A, B;
    cin >> A >> B;
    A *= 1000LL, B *= 3600LL;
    if(A > B) cout << "KoD" << endl;
    else if(A == B) cout << "same" << endl;
    else cout << "blackyuki" << endl;
    return 0;
}