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.

Input: Consider Input: ['219', '2065', '4045', 'k', 'n', 's', 'z', '7239', '1043', 'r', '2333', 'q', 'k', 'b', '2013', 'g', '6925', '9835', 'a', '5377', 'k', '8005', 'p', '9753', 'm', '201', '2353', 'f', 'n', '89', 'q', 'p', '7847', 's', 'l', '3359', '2269', 'v', 'm', '8247', '9665', 'u', 'w']

Output: a, b, f, g, k, l, m, n, p, q, r, s, u, v, w, z


Input: Consider Input: ['6209', 'x', 'j', 'w', '7965', '4905', '6297', '4291', '7183', 'a', 'l', '5267', 'r', '5935', 'a', '7865', 'h', 'p', '6117', 'a', 'y', 'y', 't', 'v', '7271', 'e', 'e', 'z', 'i', 'l', '4731', '2059', 'm', '5703', 'k', 'f', '8125', 'e', '7569', 'r', '2287', '593']

Output: a, e, f, h, i, j, k, l, m, p, r, t, v, w, x, y, z


Input: Consider Input: ['6659', '3267', 't', '9349', '5169', '4841', '2325', '5183', '763', '5701', '8333', 'c', 'e', 'f', '1819', 'y', 'i', 'b', '8545', '791', 'b', 'v', 'm', '8859', '6601', '375', 'j', '9861', 'i', '3367']


Output: b, c, e, f, i, j, m, t, v, y