#include<iostream>
using namespace std;
int main(void)
{
	int j, i, count = 0;
	char s[10][10],name[10];
	cin >> name;
	for (j = 0; j < 8;j++){
		cin >> s[j];
		for (i = 0; i < 8; i++) {
			
			if (s[j][i] == '.')
				count++;
		}
	}
	if ((name[0] == 'o'&&count % 2 == 0) || (name[0] == 'y'&&count % 2 == 1))
		cout << "oda" << endl;
	else cout << "yukiko" << endl;

	return 0;
}