import collections
x = list(input())
x = [int(_) for _ in x]
c = collections.Counter(x).most_common()
c.sort(reverse=True)
type = len(c)

if type < 2:
    print(-1)
    exit()
if len(x) == 2 and (x[0] == 0 or x[1] == 0):
    print(-1)
    exit()

ans = ""
for i in range(len(c)):
    if c[i][1] > 0:
        ac = str(c[i][0]) * c[i][1]
        ans += ac

for i in range(len(ans)):
    if ans[len(ans)-1] != ans[len(ans)-1-i]:
        idx = len(ans)-1-i
        break
#print(ans, idx)
print(ans[0:idx] + ans[len(ans)-1] + ans[idx+1:len(ans)-1] + ans[idx])