#include <bits/stdc++.h> 

using namespace std;
typedef long long ll;

int main() {
    string U1 = "oda", U2 = "yukiko";
    string user; cin >> user;
    int count = 0;
    for (int i = 0; i < 8; i++) {
        string s;
        cin >> s;
        for (int i = 0; i < 8; i++) {
            if (s[i] == 'w' || s[i] == 'b')
                count++;
        }
    }
    if (count % 2 == 0) {
        cout << (user == U1 ? U1 : U2) << endl;
    } else {
        cout << (user == U1 ? U2 : U1) << endl;
    }
}