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', '917', 'w', 't', '8873', '1431', '8059', '7041']

Ex Output:
j, t, w


Ex Input:
['8005', 'q', 'w', 'a', 'f', 'o', '6017', '7591', 'm', 'p', 'z', 'q', 'u', 'o', 'd', '6043', 'f', '3575', 'r', '2885', 'o', '3141', '621', '2375', 't', '5397', 'h', 'b', 'i', '3785', '1551', 'i', '8879', 'g', '5237', '7111', '2057', '1743', '9895', '2613', 'i', 'z', '677']

Ex Output:
a, b, d, f, g, h, i, m, o, p, q, r, t, u, w, z


Ex Input:
['9501', 'l', 'd', 'f', '4005', '7087', 'o', '2671', '9429', 'n', '5881', '2655', '3701', '619', 'a', '8229', '881', 'h', '7377', '1083', 's', '7789', '7445', 'z', '7943']

Ex Output:

a, d, f, h, l, n, o, s, z