/*
 * Reference: http://lizan.asia/blog/2012/12/11/scala-competitive/
 */

object Main extends App {
  import java.{util => ju}
  import scala.annotation._
  import scala.collection._
  import scala.collection.{mutable => mu}
  import scala.collection.JavaConverters._
  import scala.math._

  val sc = new ju.Scanner(System.in)
@tailrec
def test(a : Long, b: Long) : Boolean = {
if (a / 10 != b / 10) return test(a / 10, b / 10)
val ra = a % 10
val rb = b % 10
if (ra + rb == 11 && ra * rb == 28) {
  return ra > rb
}
return ra < rb
}
val u, v = sc.nextInt
if (test(u, v)) {
println(v)
} else println(u)
}