S=list(input())
S.sort(reverse=True)

import copy
s=copy.deepcopy(S)

for i in range(1,len(S)):
    if s[-1-(i-1)] != s[-1-i]:
        s[-1-(i-1)],s[-1-i] = s[-1-i],s[-1-(i-1)]
        break
if s[0]=="0":
    print(-1)
elif S!=s:
    print("".join(s))
else:
    print(-1)