let () =
  let rec charlist_of_string str n i = 
    if i = n then [] else str.[i] :: charlist_of_string str n (i+1) in
  Scanf.scanf "%s\n%s\n" @@ fun a b ->
  let arr = List.fast_sort compare (charlist_of_string a (String.length a) 0) in
  let brr = List.fast_sort compare (charlist_of_string b (String.length b) 0) in
  let ans = List.fold_left2 
    (fun a x y -> if x = y then a && true else false) true arr brr in
  Printf.printf "%s\n" (if ans then "YES" else "NO")