import strutils
let kuro = stdin.readLine
var shiro: string
if kuro == "oda":
  shiro = "yukiko"
else:
  shiro = "oda"
var b, w = 0
for i in 0 ..< 8:
  let bf = stdin.readLine
  b += bf.count('b')
  w += bf.count('w')

if w mod 2 == 0:
    echo kuro
else:
  echo shiro