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: ['135', 'u', '3435', '2985', '9811', 'y', '4309', '9757', '905', 'd', 'g', 'q', '1457', 'l', 'o', 'u', '4517', '2333', '3327', '577', 'a', '4041', '8101', '6211', 'f', 'j', '1721', '7217', 'q', '7443', '8477', '3117', '7779', '9339', '8615', 'm', 'c', 'f', 'c', '8979', '7895', 'k', 'w', '1619']

Output: a, c, d, f, g, j, k, l, m, o, q, u, w, y


Input: Consider Input: ['8281', '4831', '1329', 'g', 'e', '8879', 'n', 's', 'x', 'j', '6305', 'j', '921', '3677', '5107', 'n', 'j', '9285', 'a', '5329', '6671', 'c', '9283', 'l', 'a', '7907', 'q', '7605', '855', '6477']

Output: a, c, e, g, j, l, n, q, s, x


Input: Consider Input: ['2107', 'a', 'w', '7511', 'n', '9501', 'z', '5245', 'h', 'i', 'v', '8795', '9639', '2647', '6327', 'x', '607', 'e', 'b', 'y', '9561', '437', 'y', 'q', '3723', '1753', '1863', 'v', '1167', '7399', 'o', 'k', 'i', 'e']


Output: a, b, e, h, i, k, n, o, q, v, w, x, y, z