package main

import "fmt"

func main() {
	var s string
	fmt.Scan(&s)
	n := []byte(s)
	lenn := len(n)
	max := s
	for i := 0; i < lenn-1; i++ {
		for j := i; j < lenn; j++ {
			n[i], n[j] = n[j], n[i]
			if max < string(n) {
				max = string(n)
			}
			n[j], n[i] = n[i], n[j]
		}
	}
	fmt.Println(max)
}