import scala.io.StdIn.readLine

@main
def yuki39(): Unit =
  val s = readLine
  val t = s.toCharArray
  val n = s.length
  var ans: Int = s.toInt
  var temp = t(0)
  for
    i <- 0 until n
    j <- i + 1 until n
  do
    temp = t(i)
    t(i) = t(j)
    t(j) = temp
    ans = Math.max(ans, t.mkString.toInt)
    temp = t(i)
    t(i) = t(j)
    t(j) = temp
  println(ans)