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:
['7595', '5303', '3985', 'n', 'w', 's', 'r', 'f', '8237', 'q', 'y', 'f', '3121', '2463', '4597', 'q', '6801', 'f', 'i', '8563', '3267', 'k', '6157', 'f']

Ex Output:
f, i, k, n, q, r, s, w, y


Ex Input:
['4637', 'f', '2639', '8623', 'w', 'e', 'k', '5503', 'x', '6633', '7553', '1455', 'u', '1773', 'r', 'u', '1489', 'u', '1303', '9683', 'z', '565', '7041', 'x', 'z', '9431', 'k', 'v', 'j', 'z', '5469', '5665', '4089', '4951', '8263', '5675', '4095', '7745', 'z', '2437', 'd', 'e', 'w']

Ex Output:
d, e, f, j, k, r, u, v, w, x, z


Ex Input:
['773', 'c', '4023', '3497', 'c', '5415', 'f', 'm', 'n', '4447', '6433', '5337', '947', '997', 'n', 'y', 'j', '9613', '7789', 'b', 'a', 'j', '1799', '8539', '5897', '4781', 'g', 'd', 'h', 'h']

Ex Output:

a, b, c, d, f, g, h, j, m, n, y