S = raw_input()
res = int(S)
for i in range(len(S)):
    for j in range(i + 1, len(S)):
        if (i == 0):
            res = max(res, int(S[j] + S[i + 1:j]  + S[i] + S[j + 1:]))
        else:
            res = max(res, int(S[0:i] + S[j] + S[i + 1:j]  + S[i] + S[j + 1:]))
print res