let char_sum str =
  let len = String.length str - 1 in
  let rec loop i =
    if i = len + 1 then 0 else
      (int_of_char str.[1]) + loop (i+1)
  in
  loop 0

let () =
  let a, b = read_line (), read_line () in
  if char_sum a = char_sum b then print_endline "YES"
  else print_endline "NO"