s = input()
ss = []
if s == 'oda':
  ss.append('oda')
  ss.append('yukiko')  
else:
  ss.append('yukiko')
  ss.append('oda')

e = [[i for i in input().split()] for i in range(8)]

c = 0
for ee in e:
  for bw in str(ee[0]):
    if bw == 'b' or bw == 'w':
      c += 1

print(ss[c % 2])