# coding: utf-8
# Your code here!
X=list(input())

X.sort(reverse=True)
temp=X[:]

i=-1
while True:
    if X[i]=="0" and X[i-1]=="0":
        i-=1
    else:
        break

#print(i)
X[i-1],X[i]=X[i],X[i-1]

#print(X)
if temp==X or X[0]=="0":
    print(-1)
else:
    print("".join(X))