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:
['163', 'x', 'g', '5997', 'm', 'l', '7225', '7907', '375', 'y', 'a', 'j', 'c', 'j', '7755', '147', 'h', '3845', 'y', 's', 'h', 'u', '8737', '6091', 'j', 'f', 'c', '7395', '881', '1771', 'y', '3691', 'h']

Ex Output:
a, c, f, g, h, j, l, m, s, u, x, y


Ex Input:
['n', 'w', '6735', '3427', '6115', 'q', '7851', '3645', 'g', '6825', '6515', '4885', 'z']

Ex Output:
g, n, q, w, z


Ex Input:
['5115', 'l', '8255', '8949', '5725', '4253', '3683', 'd', 'm', '6823', 'k', 'l', '6305', 'u', '8013', '6735', '9209', '6779', 'x', '7229', '2193', '6635', 'z', 'j', 'z', '1895', '6553', 'i', '9701', 'x', '7183', 'h', 'r', 'j', 'i', 'f', '8825']

Ex Output:

d, f, h, i, j, k, l, m, r, u, x, z