#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
typedef long long ll;
typedef pair<int,int> pp;
const int INF = 1e9;
const int MOD = 1000000007;


int main() {
        string first;
        cin >> first;
        vector<string> b(8);
        rep(i,8) cin >> b.at(i);
        int cnt = 0;
        rep(i,8)rep(j,8){
                         if(b[i][j] == 'w' || b[i][j] == 'b') cnt ++;
        }
        if(cnt%2 == 0) cout << first << endl;
        else {
                string ans = first == "oda" ? "yukiko":"oda";
                cout << ans << endl;
        }
        return 0;
}