#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cmath>
#include <iostream>
#include <queue>
#include <list>
#include <map>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <vector>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;


int main(){
  int B=0, W=0;
  string S, str;
  cin >> S;
  rep(i,8){
    cin >> str;
    rep(j,str.length()){
      if(str[j]=='b') B++;
      if(str[j]=='w') W++;
    }
  }

  if((B+W)%2==0){
    cout << S << endl;
  }else{
    if(S=="oda") cout << "yukiko" << endl;
    else cout << "oda" << endl;
  }
  
  return 0;
}