import sequtils, strutils
let tmp: seq[int] = stdin.readline.split.map(parseInt)
var
  a: array[3, int] = [tmp[0], tmp[2], tmp[4]]
  ans: string
  odd: seq[bool] = a.mapIt(it mod 2 == 1)
if odd.count(true) mod 2 == 0:
  ans = ":-)"
else:
  ans = ":-("
echo ans