#!/usr/bin/env python3
#fileencoding: utf-8

N = list(input())
ma = 0
ma_i = -1
for i,v in enumerate(N):
    if int(v) >= ma:
        ma = int(v)
        ma_i = i

if ma_i != -1:
    N[0], N[ma_i] = N[ma_i], N[0]

print("".join(N))