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:
['5433', '4011', '2113', '2299', 'e', '9829', 'd', 'q', 'e', '3921', 'a', 'q', '8953', 'q', 'g', 'w', 'z', 'u', '4425', 'b', 'q', '5315', 'b', 'u', 'h', 'y', '9733', 'b', 'c', '1225', 'a']

Ex Output:
a, b, c, d, e, g, h, q, u, w, y, z


Ex Input:
['7065', 'q', 't', '3177', '9035', 'i', 'l', 'd', '8961', '1183', '6507', 'u', 'c', 't', '2467', '7659', 'e', '8963', 'j', 'g', 'p', '6779', '7115']

Ex Output:
c, d, e, g, i, j, l, p, q, t, u


Ex Input:
['1949', 'r', 'v', 's', 'p', 'y', '1263', '5409', '3101', '7793', 's', '5955', 'g', '5581', 'n', '6413', 'y', '7637', '9085', '4531', '617', '6763', '5139', 'b', '8667', 'u', '7275', '1709', '1385', '6961', 'a', '3947', 's', 'r', 'd', '8131', 'i', '5799']

Ex Output:

a, b, d, g, i, n, p, r, s, u, v, y