(* O(n) *)
let w = read_line ()
let n = String.length w
let _ =
  for i = Char.code 'a' to Char.code 'z' do
    let c = ref 0 in
    String.iter (fun x -> if x = Char.chr i then incr c) w;
    if !c mod 2 <> 0 then (print_endline "No"; exit 0)
  done;
  print_endline "Yes"