open Scanf ;;
open Printf ;;

exception Invalid_input ;;

let string_to_array s = Array.init (String.length s) (fun i -> s.[i]) ;;
let array_to_string s = String.init (Array.length s) (fun i -> s.(i)) ;;

let find_index f a =
  let n = Array.length a in
  let rec loop i =
    if i = n then None
    else if f a.(i) then Some i
    else loop (i + 1) in
  loop 0
  ;;

let swap i j a =
  let tmp = a.(i) in
  a.(i) <- a.(j);
  a.(j) <- tmp
  ;;

let next_permutation a =
  let n = Array.length a in
  let rec loop i =
    if i = -1 then raise Invalid_input
    else if a.(i) > a.(i + 1) then swap i (i + 1) a
    else loop (i - 1) in
  loop (n - 2)
  ;;

let () =
  let a = read_line () |> string_to_array in
  if Array.for_all (fun x -> x = a.(0)) a then
    print_endline "-1"
  else begin
    Array.sort (fun x y -> compare y x) a;
    begin match find_index (fun x -> x <> '0') a with
    | None -> raise Invalid_input
    | Some k -> 
      swap 0 k a;
      next_permutation a;
      if a.(0) <> '0' then
        array_to_string a |> print_endline
      else
        print_endline "-1"
    end
  end
  ;;