s = input()

array = []
for i in range(8):
	line = input()
	array.append(line)

count = 0
for i in range(8):
	for j in range(8):
		if array[i][j] != ".":
			count += 1

if s == 'oda':
	if count % 2 == 0:
		print('oda')
	else:
		print('yukiko')
else:
	if count % 2 == 0:
		print('yukiko')
	else:
		print('oda')