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.

Example Input: ['l', '1213', 'm', 'k', '7825', '3501', '2397', '2313', 'v', '4119', 'h', 't', '6137', 'l', '9851', 'q', '9661', 'b', 'z', '1437', '1759', 'l', '611', '5085', '4443', 'n', 'u', 'b', '2511', '6023', '7157', 'n', '9921', 'o', 'a', 'o', 'w', 't', 'o', '1607', '6751', 'n', 'b']
Example Output: a, b, h, k, l, m, n, o, q, t, u, v, w, z

Example Input: ['8381', 'j', '761', '5431', '7601', 'd', '4339', '1479', 'b', 'x', 'f', 'w', '2437', '7725', '6385', '411', 'w', 'w', 'i', '2769', '5709', '5703', 'k', '5301', '6503', '7833', 'y', '3813', '7061', '5531', 'n', '2251', 'y', '8941', '8481', 's', 't', 't', '3345', 'k', '1545']
Example Output: b, d, f, i, j, k, n, s, t, w, x, y

Example Input: ['e', '9193', '8733', '1949', '2649', 'h', '3863', '757', 'w', 'x', 'o', 'u', '5575', 'i', 'g', 'u', '5177', 'b', 'l', '2693', 'c', '9751', '6469', '2887', 'e', 'r', 't', '9391', 'f', '2859', '6609', '4451', 'r', 'h', 'q', 'g', 'l', 'j', 'r', '4883', '8609', '3299', '3699', 'o', 'd']
Example Output:
b, c, d, e, f, g, h, i, j, l, o, q, r, t, u, w, x