s = input().strip()
board = [input().strip() for _ in range(8)]

count_b = sum(row.count('b') for row in board)
count_w = sum(row.count('w') for row in board)

n_moves = count_b + count_w - 4
next_color = 'b' if n_moves % 2 == 0 else 'w'

if next_color == 'b':
    print(s)
else:
    print('yukiko' if s == 'oda' else 'oda')