import itertools
def abc(S):
    s=sorted(S)
    for i in range(len(s)-1):
        if s[i]!=s[i+1]:
            s[i],s[i+1]=s[i+1],s[i]
            if s[-1]=='0':    return -1
            return "".join(s[::-1])
    return -1

def main():
    S=input()
    print(abc(S))

main()