import itertools

n = input()
nls = list(map(int, list(n)))
l = len(nls)

ls = [int(n)]
for i in itertools.permutations([i for i in range(l)],2):
    tmp = nls.copy()
    tmp[i[0]], tmp[i[1]] = tmp[i[1]], tmp[i[0]]
    ls.append(int("".join([str(i) for i in tmp])))
print(max(ls))