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:
['1223', 'h', 'a', 'o', 'v', '2535', 'g', '6267', 'w', '9625', '7961', '9577', '7611', '5655', 'p', 'j', 's', '2141', '4101', 'l', '4367', '9383', 'n', '5965', '9097', '7571', 'p', 'u', 'x']

Ex Output:
a, g, h, j, l, n, o, p, s, u, v, w, x


Ex Input:
['u', 'd', '4193', '5687', 'p', 'r', '7787', 't']

Ex Output:
d, p, r, t, u


Ex Input:
['e', '7717', '613', '5505', 't', '8745', '3317', '8893', '8293', '1395', 'b', 'k', 'l', 'o', 'c', '7419', 'j', '1259', 'f', '3067', '5411', '2427', 'a', 'l', '7347', '9299', '2817', 'q', 'w', '7865', 'e', '9737', '8215', 'k', '9463', 's', 'm', 'n', 'o', 'n']

Ex Output:

a, b, c, e, f, j, k, l, m, n, o, q, s, t, w