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

int main() {
    string s[2];
    cin >> s[0];
    s[1] = (s[0] == "oda" ? "yukiko" : "oda");
    int cnt = 0;
    for(int i=0; i<8; ++i) {
        string b;
        cin >> b;
        cnt += count(b.begin(), b.end(), 'w') + count(b.begin(), b.end(), 'b');
    }
    cout << s[cnt%2] << endl;
}