from collections import Counter
x = list(input())
ctr = Counter(x)
if ctr['0']==0:
    if len(ctr.keys())==1:
        print(-1)
        exit()
else:
    t = 0
    for i in range(1, 10):
        t += ctr[str(i)]
    if t==1:
        print(-1)
        exit()
d = dict(sorted(ctr.items(), reverse=True))
ret = ''    
for k,v in d.items():
    ret += k*v
for i in range(len(ret))[::-1]:
    if ret[i]!=ret[i-1]:
        ans = ret[:i-1]+ret[i]+ret[i-1]+ret[i+1:]
        break
print(ans)