import math
import numpy as np
import queue
import sys 

input = sys.stdin.readline
# sys.setrecursionlimit(25000)

s = input().strip()

players = ['oda', 'yukiko']
stones = 0

for i in range(8):
    row = input()

    stones += row.count('w')
    stones += row.count('b')

if s == players[0] and stones % 2 == 0:
    print(players[0])
if s == players[1] and stones % 2 == 0:
    print(players[1])
if s == players[0] and stones % 2 == 1:
    print(players[1])
if s == players[1] and stones % 2 == 1:
    print(players[0])