import sequtils,strutils,algorithm,math,future,macros
template get*():string = stdin.readLine().strip()
proc toSeq(str:string):seq[char] = result = @[];(for s in str: result &= s)
let
  isStartPlayer = get() == "oda"
  frames = newSeqWith(8,get().toSeq().filterIt(it!='.').len())
if frames.sum() == 4 or frames.sum() mod 2 == 1 : echo "oda"
else: echo "yukiko"