import sys


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    x = sorted(input(), reverse=True)
    for i in range(len(x) - 1, 0, -1):
        if x[i] != x[i - 1]:
            x[i], x[i - 1] = x[i - 1], x[i]
            break
    else:
        print(-1)
        return

    if x[0] == '0':
        print(-1)
        return

    print(''.join(x))


if __name__ == '__main__':
    main()