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', '5503', '5837', '4539', '7631', 'm', '2641', 'p', '7901', '8117', 'z', '3373', '3215', 'v', 'a', '5949', 'w', '9049', 'd', 'a', 'l', 'v', 'l', 'n', 'w', 'r', 'j', '9031', '9609', '4209', 'c', '7453', '5855', '2883', '5941', 't', '4283', 'x', 'x', 'n', 'c']

Ex Output:
a, c, d, j, l, m, n, o, p, r, t, v, w, x, z


Ex Input:
['f', '217', '449', 't', 'j', '4097', '5561', '8317', '647', 'u', 'b', '7833', 'r', '9011', 'z', '2753', '2183', 'z', 'o', 'g', '7541', 'b', '8795', '327', 'v', 'e', 't', 'l', '4909', 'k', '7681', 'r']

Ex Output:
b, e, f, g, j, k, l, o, r, t, u, v, z


Ex Input:
['9979', 'p', '2447', 'f', '9993', 'c', '9023', '8151', 't', 'g', 'r', 'o', '2045', 'e', 'e', '4473', 't', '6929', '2021', 'n', 'q', 's', 'm', 'i', '8009', '6387', 'a', '7345', '2351', 'm', 'h', '3561', '6591', '8871']

Ex Output:

a, c, e, f, g, h, i, m, n, o, p, q, r, s, t