#include <stdio.h>

int main(void) {
	int i, j;
	int stone = 0;
	char name[10];
	char b[10];
	scanf("%s", name);
	for(i = 0;i < 8;i++){
		scanf("%s", b);
		j = 0;
		while(b[j] != '\0'){
			if(b[j] != '.')stone++;
			j++;
		}
	}
	if((name[0] == 'o' && stone % 2 == 0) || (name[0] == 'y' && stone % 2 != 0))printf("oda\n");
	else printf("yukiko\n");

	return 0;
}