fun main(args: Array<String>) {
    val n = readLine()!!.map { it.toString().toInt() }.toMutableList()
    val a = mutableListOf<MutableList<Int>>().also { it.add(n) }
    for(i in (0 until n.lastIndex)) {
        for(j in (1 .. n.lastIndex)) {
            val tmp = n.toMutableList()
            tmp[i] = n[j]
            tmp[j] = n[i]
            a.add(tmp)
        }
    }
    println(a.map { it.joinToString("") }.sortedDescending().first())
}