def next_bigger(n):
    n = [int(x) for x in str(n)]
    key = []
    if len(n) <= 1:
        return -1
    for i in range(len(n) - 1, 0, -1):
        if n[i] > n[i - 1]:
            cor = [n[x] for x in range(i - 1, len(n))]
            for num in cor:
                if num > cor[0]:
                    key.append(num)
                    key = sorted(key)
                    z = cor.index(key[0])
            cor[0], cor[z] = cor[z], cor[0]
            cor = str(cor[0]) + ''.join(sorted([str(cor[x]) for x in range(1, len(cor))]))
            m = 0
            for j in range(i - 1, len(n)):
                n[j] = int(cor[m])
                m += 1
            return int(''.join([str(n[x]) for x in range(len(n))]))
    return -1