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