s = input()

counter = [0 for i in range(10)]
for i in s:
    counter[int(i)] += 1
l = len(s)
ans = -1
if counter[0] < l-1 and  max(counter) != l:
    ans = 0
    first = []
    for i in range(9,-1,-1):
        first += [str(i)] * counter[i]
    lf = len(first)

    for i in range(lf-2, -1, -1):
        if first[i] != first[i+1]:
            first[i], first[i+1] = first[i+1], first[i]
            break

    ans = "".join(first)
        
print(ans)