object Solution {
    import scala.io.StdIn.{readInt, readLine}

    def main(args: Array[String]): Unit = {
        val A = readList
        val B = readList
        println(missingVals(A, B).sorted.mkString(" "))
    }

    def readList: List[Int] = {
        val _ = readInt
        readLine.split(' ').map(_.toInt).toList
    }

    def missingVals[T](A: List[T], B: List[T]): List[T] = {
        val (mapA, mapB) = (countMap(A), countMap(B))
        (mapA.keySet | mapB.keySet)
            .filterNot(n => mapA(n) == mapB(n))
            .toList
    }

    def countMap[T](l: List[T]): Map[T, Int] = {
        val m = Map.empty[T, Int].withDefaultValue(0)
        l.foldLeft(m)((m, e) => m + (e -> (m(e) + 1)))
    }
}