import scala.io.StdIn

object Main {
  def main(args: Array[String]): Unit = {
    val n = StdIn.readLine().toArray
    val sz = n.size

    var ans: Long = 0
    for (i <- (0 until sz); j <- (i until sz)) {
      val tmp = n.clone
      val ch = tmp(i)
      tmp(i) = tmp(j)
      tmp(j) = ch
      ans = Math.max(ans, tmp.mkString.toLong)
    }

    println(ans)
  }
}