#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
using namespace std;

int main()
{
    string s;
    cin >> s;

    int cnt = 0;
    for(int i=0; i<64; ++i){
        char c;
        cin >> c;
        if(c != '.')
            ++ cnt;
    }

    if((s == "oda") ^ (cnt % 2 == 0))
        cout << "yukiko" << endl;
    else
        cout << "oda" << endl;

    return 0;
}