s = input()
count = -4

for i in range(8):
  row = input()
  for j in range(8):
    if row[j] == 'w' or row[j] == 'b':
      count += 1

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