fun main(args:Array) { val a = readLine()!! val b = a.toList().sorted().reversed().map { it.toString().toInt() }.toMutableList() //println(a) //println(b) val last = b.last() var good = false for(i in b.size-1 downTo 0 step 1) { //println(b[i]) if( last != b[i]) { good = true b[b.size-1] = b[i] b[i] = last break } } if(good == false) { println(-1) } else if(b.first() == 0) { println(-1) } else { println(b.map{it.toString()}.joinToString("")) } }