from collections import Counter

x = list(input().strip())

c = Counter(x)

if len(c.keys()) == 1:
    print(-1)
elif c['0'] == len(x) - 1:
    print(-1)
else:
    v = sorted(c.keys())[1]
    c[v] -= 1
    for i in sorted(c.keys(), reverse=True):
        print(i * c[i], end='')
    print(v)