#coding:utf-8

S=raw_input()
B=[raw_input() for i in range(8)]

s=''
for i in B:
	s+=i

if S=='oda':
	if (s.count('b')+s.count('w'))%2==0:
		print 'oda'
	else:
		print 'yukiko'
else:
	if (s.count('b')+s.count('w'))%2==0:
		print 'yukiko'
	else:
		print 'oda'