# coding: utf-8
# Your code here!

s = input()
board = []
for i in range(8):
    cur_s = input()
    cur_list = list(cur_s)
    board.append(cur_list)
    
count = -4
for i in range(8):
    for j in range(8):
        if board[i][j] != '.':
            count += 1
           
if s == 'oda':
    second = 'yukiko'
else:
    second = 'oda'
    
if count % 2 == 0:
    print(s)
else:
    print(second)