module Yuki

open System
open System.Text

let inline ret x = Some x
let inline (>>=) (m: Option<'a>) f =
    match m with
    | Some x -> f x
    | None -> None

type MaybeBuilder () =
    member __.Return(x) = ret x
    member __.Bind(m, f) = m >>= f

let maybe = MaybeBuilder ()

let solve n =
    let num2list n =
        let rec f acc n =
            if n < 10 then n :: acc
            else f (n % 10 :: acc) (n / 10)
        f [] n
 
    let rec list2str (acc : StringBuilder) =
        function
        | [] -> acc.ToString()
        | x :: xs -> list2str (acc.Append(string x)) xs

    let rec f (acc : StringBuilder) xs =
        let xsMax = xs |> List.max
        match xs with
        | x :: xs when x = xsMax -> f (acc.Append(string x)) xs
        | x :: xs -> 
            let swapRightIdx =
                xs
                |> List.indexed
                |> List.findBack (fun (_, x) -> x = xsMax)
                |> fun (idx, _) -> idx
            let xs' =
                xs
                |> List.mapi (fun i v ->
                    match i with
                    | _ when i = swapRightIdx -> x
                    | _ -> v)
            list2str (acc.Append(string xs.[swapRightIdx])) xs'
        | [] -> failwith ""
    
    n
    |> num2list
    |> f (new StringBuilder())

let N = int <| Console.ReadLine()

solve N
|> Console.WriteLine