def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))

S=list(input())
N=len(S)

# 1種類だとダメ
S2=set(S)
if len(S2)==1:
    print(-1)
    exit()

# 最上位以外全部0だとダメ
cnt=S.count("0")
if cnt==N-1:
    print(-1)
    exit()
# print(cnt)
    
    
S.sort(reverse=True)

for i in range(N-1,0,-1):
    if S[i]!=S[i-1]:
        S[i],S[i-1]=S[i-1],S[i]
        break
    
print(''.join(map(str, S)))