def sumuj(list1:List[Int],list2:List[Int])= {
    def sumujR(list1:List[Int],list2:List[Int],acc:List[Int]):List[Int]=
        (list1,list2) match {
        case (Nil,Nil) => acc
        case (hd1::tl1,hd2::tl2) => sumujR(tl1,tl2,((hd1+hd2)::acc))
        case (hd1::tl1,Nil) => sumujR(tl1,Nil,(hd1::acc))
        case (Nil,hd2::tl2) => sumujR(Nil,tl2,(hd2::acc))
        }
    sumujR(list1,list2,Nil)
}

def sumujR(list1:List[Int],list2:List[Int]):List[Int]=
        (list1,list2) match {
        case (hd1::tl1,hd2::tl2) => (hd1+hd2)::sumujR(tl1,tl2)
        case (hd1::tl1,Nil) => hd1::sumujR(tl1,Nil)
        case (Nil,hd2::tl2) => hd2::sumujR(Nil,tl2)
        case (Nil,Nil) => Nil
        }