S = str(input())
T = 0

for a in range(8):
    L = [str(x) for x in str(input())]
    for x in L:
        if x == 'w' or x == 'b':
            T += 1

if T % 2 == 0:
    print('oda' if S =='oda' else 'yukiko')
else: print('oda' if S =='yukiko' else 'yukiko')