package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	s := readLine()
	sRune := []rune(s)
	n := make([]rune, len(sRune))
	max := make([]rune, len(sRune))
	copy(max, sRune)
	for i := 0; i < len(s)-1; i++ {
		for j := i; j < len(s); j++ {
			copy(n, sRune)
			n[i], n[j] = n[j], n[i]
			if string(max) < string(n){
				copy(max, n)
			}
		}
	}
	fmt.Println(string(max))
}

var rdr = bufio.NewReaderSize(os.Stdin, 1000000)

func readLine() string {
	buf := make([]byte, 0, 1000000)
	for {
		l, p, e := rdr.ReadLine()
		if e != nil {
			panic(e)
		}
		buf = append(buf, l...)
		if !p {
			break
		}
	}
	return string(buf)
}