def toFlatMap(input:List[Any],result:List[Int]):List[Int]=input match{

   case h::t=>h match {case e:Int=>toFlatMap(t,e::result)

                       case  x:List[Any] => toFlatMap(t,toFlatMap(x,result))

                       case _=>toFlatMap(t,result)}

   case Nil=>result

   case _=> result

 }

 val myList=List("a",List("a,",1000,2000),11,2,3,4,"abc",5,List(6,List(100,200),2,1).reverse,"a")

 print(toFlatMap(myList,List[Int]()).reverse)