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:
['j', 'a', 'z', 'h', '4129', '4159', 'm', 'o', 'o', '1193', '2905', '3083', 'q', 't', 'm', 'o', '673', '7547', 'n', 'c', 'r', 't', '2897', '4959', 'z', '2377', 'y', '7977', 'u', 'b', 's', 'w', 'e', 'd', '8051']

Ex Output:
a, b, c, d, e, h, j, m, n, o, q, r, s, t, u, w, y, z


Ex Input:
['7109', '1243', 'f', 'z', 'h', 'd', '6169', 'v', 'h', '3609', '3181', 'd', '3661', '7193', '7341', '9127', 'r', '1623', '5813', 's', 'd', '4011', '4983', 'n', '4195']

Ex Output:
d, f, h, n, r, s, v, z


Ex Input:
['o', 'k', '2571', 'e', '3353', '8217', 'p', 'q', 'd', 'a', 'x', 'g']

Ex Output:

a, d, e, g, k, o, p, q, x