In this task, you are given an input list A comprising of numbers and alphabets. You need to extract and sort the unique alphabets in the list. The alphabets in the input list will only be in lowercase. Return -1 if there is no alphabet in the input list.

Ex Input:
['o', '1217', '449', 'n', 'e', 'o', 't', '9043', '1925', '5687', '7197', '7943', 'u', '5053', 'q', 'e', '89', 'l', 'h', '3083', '4295', 'o', 'n', '6309', '743', 'n', 'j', '2105', 's', '6845', 'p', 'p', '1355', '3757', 'v', 'f', '961', '4623', '4633', 'p', '4593', 'p', '7337', 'o', 'u']

Ex Output:
e, f, h, j, l, n, o, p, q, s, t, u, v


Ex Input:
['z', '2519', '4799', '4715', '7165', 'r', 'r', 'l', 'n', '6925', '8935', '9795', '5489', 'v', 'u', '6527', '2241', 'u', 'c', 'w', '9755', 'w', '9823', 'g']

Ex Output:
c, g, l, n, r, u, v, w, z


Ex Input:
['8469', '1683', '6029', 'g', '4623', '6891', 'w', 'l', '2603', 'g', 'z', '8861', '3503', '8503', '7253', 'a', '6049', 'g', '6835', '6649', 'z', '423', 'f', '1971', 't', '3919', '3097', 'd', 'g', '3151', 'y', 'l', 'c', 'e', '3377', 'o', '9975', '7533', 'o', 's', '3001', '7479', 'd', '7329']

Ex Output:

a, c, d, e, f, g, l, o, s, t, w, y, z