s = list(input())
n = len(s)
s = sorted(s)[::-1]

for i in range(n - 1):
    # s[-1-i]とs[-2-i]
    if s[-1-i] == s[-2-i]:
        continue
    s[-1-i], s[-2-i] = s[-2-i], s[-1-i]
    if s[0] == '0':
        s[-1-i], s[-2-i] = s[-2-i], s[-1-i]
        continue
    print(''.join(s))
    exit()
print(-1)