S=input()
a=0
for i in range(8):
	for j in list(input()):
		if(j!='.'):
			a+=1
a%=2
if(a==1):
	if(S=='oda'):
		print("yukiko")
	else:
		print("oda")
if(a==0):
	if(S=='oda'):
		print("oda")
	else:
		print("yukiko")