#include<bits/stdc++.h>
using namespace std;
int main(){  
    int cnt = 0;
    string S, A; cin >> S;
    for(int i=0; i<8; i++){
        cin >> A;
        for(int j=0; j<8; j++){
            if(A[j] == 'b' || A[j] == 'w') cnt++;
        }
    }
    if(cnt % 2 == 0 && S == "oda"){
        cout << S << endl;
    }else if(cnt % 2 == 0 && S == "yukiko"){
        cout << "yukiko" << endl;
    }else if(cnt % 2 != 0 && S == "oda"){
        cout << "yukiko" << endl;
    }else if(cnt % 2 != 0 && S == "yukiko"){
        cout << "oda" << endl;
    }
    return 0;
}