#include <iostream>
#include <string>
using namespace std;

int main() {
    string s;
    int cnt = 0;
    cin >> s;
    char c;
    for (int i = 0; i < 64 && cin >> c; i++) {
        if (c != '.')
            cnt++;
    }
    if (cnt % 2 == 0)
        cout << s << endl;
    else
        cout << (s == "oda" ? "yukiko" : "oda") << endl;
    return 0;
}