X = input()

if int(X) % 10 == 0 or len(set(X)) == 1:
    print(-1)
else:
    X = list(X)
    X.sort()
    p = X[0]
    n = len(X)
    for i in range(1, n):
        if p != X[i]:
            tmp = X[i]
            X[i] = p
            X[0] = tmp
            print(''.join(X[::-1]))
            exit()