#!/usr/bin/python
# -*- coding: utf-8 -*-

Name = raw_input()
num = 0
for i in xrange(8):
	 num += raw_input().count('.')
if ( 64 - num ) % 2 == 0:
	print Name
else:
	if Name == "oda":
		print "yukiko"
	else:
		print "oda"