#include <bits/stdc++.h>
using namespace std;
int main() {
    #ifdef DEBUG
    std::ifstream in("/home/share/inputf.in");
    std::cin.rdbuf(in.rdbuf());
    #endif
    string S;
    cin >> S;
    int n = 0;
    if(S == "oda") n++;
    for(int i = 0; i < 8; i++) {
        string tmp;
        cin >> tmp;
        for(int j = 0; j < 8; j++) {
            n += tmp[j] != '.';
        }
    }
    bool ans = n % 2;
    cout << (ans ? "oda" : "yukiko") << endl;
    return 0;
}