let list_of_string str =
  let lstr = String.length str in
  let rec list_of_string' idx result =
    if idx >= lstr then result
    else list_of_string' (idx + 1) (str.[idx] :: result)
  in
  list_of_string' 0 []

let () =
  let a = read_line ()
  and b = read_line ()
  in
  let alst = list_of_string a |>
             List.sort compare
  and blst = list_of_string b |>
             List.sort compare
  in
  alst = blst |> (function true -> "YES" | false -> "NO") |> print_endline