#include <iostream>
using namespace std;

int main() {
    string s, s2;
    cin >> s;
    if (s == "oda") s2 = "yukiko";
    else s2 = "oda";

    int b_cnt = 0, w_cnt = 0;
    for (int i = 0; i < 8; i++) {
        string b;
        cin >> b;
        for (char ch : b) {
            if (ch == 'w') w_cnt++;
            else if (ch == 'b') b_cnt++;
        }
    }
    if (w_cnt == b_cnt) cout << s << endl;
    else cout << s2 << endl;
}