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:
['7301', '7999', 'x', 'r', '6881', 'e', '609', 's', '7495', 'a', 's', '1961', 'q', 'x', '373', '6289', '4847', '5969', 't', '5487', '7639', '9039', '2395', 'b', 'd', '1447', 's', '8137', 's', '443', 'f', 'z', '4823', 'k', 'i', 'o', '4739', 'w', 'f', '8853', 'a']

Ex Output:
a, b, d, e, f, i, k, o, q, r, s, t, w, x, z


Ex Input:
['2393', 'c', '4413', '5529', '1487', '2499', 'i', 's', 'i', '8575', 'm', 'z', '7179', '6637', '9181', 'z', 'h', '2487', 'i', '3779', '2017', '5217', '5013']

Ex Output:
c, h, i, m, s, z


Ex Input:
['z', '7211', 'c', 'r', '4719', 't', '7843', 's', '9793', 'w', 'd', '6055', '2135', 't', '8519', '365', 'a', 'c', '1625', '9043', 'j', '7515', 's', '9259', 't', 'o', '4073', 'e', '9965', 'p']

Ex Output:

a, c, d, e, j, o, p, r, s, t, w, z