s=input()
l=[list(input()) for i in range(8)]
ct=0
for i in range(8):
  for j in range(8):
    if l[i][j]!='.':
      ct+=1
if ct%2==0:
  print(s)
else:
  if s=='oda':
    print('yukiko')
  else:
    print('oda')