let w = read_line ()

let h = Hashtbl.create (String.length w)

let () =
  String.iter
    (fun c ->
       let v = try Hashtbl.find h c with Not_found -> 0 in
       Hashtbl.replace h c (v + 1))
    w ;
  ( if Hashtbl.fold
      (fun _ v pre -> v mod 2 = 0 && pre) h true then "Yes" else "No" )
  |> print_endline