#include <stdio.h>

int main() {
	char b[7], *w, board[9];
	int cnt = 0, i, j;

	scanf("%s", b);
	if (b[0] == 'y') w = "oda";
	else w = "yukiko";

	for (i = 0; i < 8; i++) {
		scanf("%s", board);
		for (j = 0; j < 8; j++) {
			if (board[j] == '.') cnt++;
		}
	}
	
	if (cnt % 2 == 0) printf("%s\n", b);
	else printf("%s\n", w);

	return 0;
}