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:
['789', '3603', '3517', '5831', 'z', 'q', 'w', 'l', '5701', '9503', '8169', '1123', 'e', '529', 'j', 'z', 'l', 'o', '3705', 'o', '5131', '6063', 'c', 'j', '6275', '7701']

Ex Output:
c, e, j, l, o, q, w, z


Ex Input:
['4371', '9499', 'e', 'w', '9969', '8367', '2897', '1745', 'i', '7049', '9773', 'h', '9649', 'u', '4673', '8513', '8547', 'z', '1995', '7739', '2215', '171', 'c', '7527', '2479', 't', '5223', 'p', '2313', '3243', '2281', 'r', 'c']

Ex Output:
c, e, h, i, p, r, t, u, w, z


Ex Input:
['x', '3109', 's', '1799', 'r', 'r', '7927', '6009', 'd', 'u', '2499', 'm', '345', '5157', '2127', '9207', 'k', '6797', 'b', 'm', 'j', '8227', '9699', '2585', 'a', 't', '7141', '4599', '9685', 'u', 'e', '4397', '9441', '2193', 'i', '6645', 'n', '6995']

Ex Output:

a, b, d, e, i, j, k, m, n, r, s, t, u, x