#include<stdio.h>

int main(void){   
	int c,i,j,r;
	char s[16];
	scanf("%s",s);
	if(s[0] == 'y'){r++;}
	for(i = 1;i <= 8;i++){
		scanf("%s",s);
		for(j = 0;j <= 7;j++){
			if(!(s[j] != '.')){r++;}
		}
	}
	if(r%2){printf("yukiko\n");}else{printf("oda\n");}
	return 0;
}