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:
['x', '4283', 'n', 'b', 'g', 'p', '8305', '7781', '5907', 's', '1305', 'w', '8623', 'o', 'c', 'u', '1839', '2869', '7537', 'y', '2395', '5309', 'e', '4059', 'l', '6647', 'p', '9717', 'y', 'y', '3769', '2527', '2981', '5255', '4063', 'j', '4843', 'j', '9355', 'z']

Ex Output:
b, c, e, g, j, l, n, o, p, s, u, w, x, y, z


Ex Input:
['l', 'i']

Ex Output:
i, l


Ex Input:
['d', 'i', 'd', '4483', 'o', 'o', 'b', 'a', '3187', '3407', '1939', 'h', 'f', '4709', '2635', '6805', '9353', 'l', 'g', 'p', 'q', 'w', '7871']

Ex Output:

a, b, d, f, g, h, i, l, o, p, q, w