#include<bits/stdc++.h>
#define rep(i,a,n) for (int i = a;i < n;i++)
using namespace std;

int main(){
    string p1,p2; cin >> p1;
    int c = 0;
    rep(i,0,8){
        string b; cin >> b;
        rep(j,0,8){
            cin >> b[j];
            if(b[j] == 'b' || b[j] == 'w') c++;
        }
    }

    if(p1 == "oda"){
        p2 = "yukiko";
    }else{
        p2 = "oda";
    }

    if(c % 2 == 0){
        cout << p1 << endl;
    }else{
        cout << p2 << endl;
    }
}