#coding: utf-8
##yuki_88

name=raw_input()
wc=0
for i in xrange(8):
 s=raw_input()
 wc+=8-s.count('.')

if wc%2==0:
 if name=="oda":
  print "oda"
 else:
  print "yukiko"
else:
 if name=="oda":
  print "yukiko"
 else:
  print "oda"