/*
yukicoder No.88 次はどっちだ
解答者：ヒロソフ
*/
#include <stdio.h>

int main(void) {
	char Fast[10];
	char Last[10];
	scanf("%s", Fast);
	if (Fast[0] == 'o') sprintf(Last, "yukiko");
	else sprintf(Last, "oda");
	char board;
	int count = -4;
	for (int y = 0; y < 8; y++) {
		for (int x = 0; x < 8; x++) {
			scanf("%c", &board);
			if (board == '\n') {
				x--;
				continue;
			}
			if ((board == 'w') || (board == 'b')) count++;
		}
	}
	if ((count % 2) == 0)printf("%s\n", Fast);
	else printf("%s\n", Last);
	return 0;
}