#include <iostream>
#include <string>
using namespace std;
typedef signed long long ll;
 
#define REP(i,n) for (int i = 0; i < (n); i++)
#define RREP(i,n) for (int i = (n)-1; i >= 0; i--)
#define FOR(i,s,n) for (int i = (s); i < (n); i++)
#define RFOR(i,s,n) for (int i = (n)-1; i >= (s); i--)
 
 
int main() {
	
	int count = 0;
	
	string player,row;
	
	bool flag;//0 oda, 1 yukiko
	
	cin >> player;
	flag = (player=="yukiko");
	
	REP(i,8){
		cin >> row;
		REP(j,8)if(row[j] != '.')count++;
	}
	(count%2)?flag = !flag:flag = flag; 
	
	cout << (flag?"yukiko":"oda")<<endl;
 
	return 0;
}