fun readStr () =
    let
        fun scan reader stream = SOME (StringCvt.splitl (not o Char.isSpace) reader (StringCvt.skipWS reader stream))
    in
        valOf (TextIO.scanStream scan TextIO.stdIn)
    end



val () =
    let
        val a = readStr ()
        val b = readStr ()
    in
        print (b ^ " " ^ a ^ "\n")  
    end