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:
['4653', 'e', 'c', 'j', '6739', '3963', 'q', '4649', 'v', 's', 'j', '9757', '8075', '6253', '4365', 's', '9101', 'd', '6989', 't', '5687', '7389', '139', '4029', '5073', 'q', 'e', '2455', '1075', 'j', '1329', 'l', '4689', 't', 'z', '4179', 's', 'l', 'w', 'n', '6569', '8907', 'v', '605', 'y']

Ex Output:
c, d, e, j, l, n, q, s, t, v, w, y, z


Ex Input:
['9425', 'l', 'c', 'n', '5925', '2543', '3935', 'c', '7533', 'j', 'q', '3775', '5897', '9435', '69', 'e']

Ex Output:
c, e, j, l, n, q


Ex Input:
['m', '1147', 'v', '645', '4263', 'j', 'u', 'p', 'v', 'e', '7479', '9003', '8757', '5171', 'o', 'l', 'z', '3115', 'o', '1721', '8403', 'u', '6481', 'o', 'p', 'x', 'q', '5803', '2177', '3827', 'i', 'l', 'u', 'm', '1115', 'j', 'n', '4535', '3847', '2695']

Ex Output:

e, i, j, l, m, n, o, p, q, u, v, x, z