#include <iostream>
#include <cstring>
#include <cmath>
using namespace std;

int main(){
	string a;
	char b[10][10] = {"0"};
	cin >> a ;
	int i,j;
	for(i=0; i<8; i++){
		cin>>b[i];
	}

	int bl=0;
	int wt=0;
	for(i=0;i<8;i++){
		for(j=0;j<8;j++){
			if(b[i][j] == 'b')  bl++;
			if(b[i][j]== 'w')  wt++;
		}
	}

	if((bl+wt)%2 == 0)  cout << a;
	else{
		if(a == "oda")  cout << "yukiko";
		else cout << "oda";
	}
	cout << endl;
	return 0;
}