import util.control.Breaks._

object Main {
  def pp(ary: Array[Int]) {
    val s = ary.mkString(",")
  }

  def digits(n: Int): Array[Int] = {
    val s = n.toString.chars.toArray.map(e => e - '0'.toInt)
    s
  }

  def main(args: Array[String]) {
    val sc = new java.util.Scanner(System.in)
    val s = sc.nextInt

    var ds = digits(s)
    breakable {
      for (i <- 0 to ds.length-1) {
        var swap = false
        var c = ds(i)
        var index = i
        for (j <- i to ds.length-1) {
          if (ds(i) < ds(j) && c <= ds(j)) {
            c = ds(j)
            index = j
          }
        }

        if (index > i) {
          val t = ds(i)
          ds(i) = ds(index)
          ds(index) = t
          break
        }
      }
    }

    println(ds.mkString)
  }
}