# -*- coding: utf-8 -*-
"""
No.39 桁の数字を入れ替え
https://yukicoder.me/problems/no/39

"""
import sys
from sys import stdin
input = stdin.readline


def find_nums(numbers, target):
    res = []
    for i, n in enumerate(numbers):
        if n == target:
            res.append(i)
    return res


def main(args):
    N = list(input().strip())
    largest = sorted(N, reverse=True)

    t1, t2 = 0, 0
    for n, l in zip(N, largest):
        if n != l:
            t1 = l
            t2 = n
            break

    if t1 != 0:
        p1 = find_nums(N, t1)
        p2 = find_nums(N, t2)
        N[p1[-1]], N[p2[0]] = N[p2[0]],N[p1[-1]]

    print(*N, sep='')


if __name__ == '__main__':
    main(sys.argv[1:])