from itertools import permutations

X = list(input())
p = permutations(X)

s = []

for i in p:
    if i[0] != "0":
        s.append(i)

s = list(set(s))
s.sort(reverse=True)

ans = ""

if len(s) == 1:
    print(-1)
    exit()
else:
    ans = ans.join(list(s[1]))

print(ans.replace(",", ""))