#include "bits/stdc++.h"
using namespace std;

#define REP(i, n) for(int i=0; i<(n); i++)

string s, l;
signed main()
{
    cin >> s;
    int cnt = 0;
    string ps[2] = {"oda", "yukiko"};
    if (s != "oda") swap(ps[0], ps[1]);
    REP(i,8) {
        cin >> l;
        for (char c : l) {
            if (c != '.') cnt++;
        }
    }
    cout << ps[cnt%2] << endl;
    return 0;
}