#include <iostream>
#include <algorithm>

using namespace std;

int main() {
    auto te = {"oda", "yukiko"};
    string s;
    cin >> s;

    int countw = 0;
    int countb = 0;

    string b;
    for (int i = 0; i < 8; ++i) {
        cin >> b;
        countw += count(b.begin(), b.end(), 'w');
        countb += count(b.begin(), b.end(), 'b');
    }

    if ((countw - countb) % 2) {
        if (s == "oda") cout << "yukiko" << endl;
        else cout << "oda" << endl;
    } else {
        cout << s << endl;
    }

    return 0;
}