#include <iostream>
#include <vector>
#include <algorithm>
#include <math.h>

#define ALL(x) (x).begin(),(x).end()
#define REP(i,n) for(int i = 0;i < (n);i++)

using namespace std;

int main(){
    string s;
    int count = 0;
    cin >> s;
    REP(i, 8){
        string b;
        cin >> b;
        REP(j, 8){
            if(b[j] == 'w' || b[j] == 'b')count++;
        }
    }
    if(count%2 == 1)s = s == "oda" ? "yukiko" : "oda";
    cout << s << endl;
    return 0;
}