object Main{
  def main(args: Array[String]){
    val input=io.Source.stdin.getLines().mkString("\n");
    println(solve(input).trim());
  }

  def solve(input:String):String={
    if(input.split(" ").map(_.toInt).zipWithIndex.filter{v => v._2%2==0 && v._1%2==1 }.size % 2 == 0){
      ":-)"
    }else{
      ":-("
    }
  }
}