let string_1_list_of_string x =
  String.to_seq x
  |> List.of_seq
  |> List.map (String.make 1);;

let array_of_string s =
  string_1_list_of_string s |> Array.of_list;;

let replace_int s ar =
  let s = string_1_list_of_string s in
  let rec replace_p result s =
    match (s) with
    | [] -> result |> List.rev |> String.concat ""
    | hd::tr ->
      try
        replace_p (ar.(int_of_string hd) :: result) tr
      with 
      | Failure _ -> replace_p (hd::result) tr in
  replace_p [] s;;

let () =
  let a = array_of_string (read_line ()) in
  let s = read_line () in
  replace_int s a |> print_string;
  print_newline ();;