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: ['z', '5601', '5675', 'w', 's', 'z', '9213', '9563', '1699', 'p', 'g', 'm', 'c', '9279', '4481', 'p', 'n', '2389', 'c', '503', '1901', '8827', '1701', '1607', '5633', 'a', 'z', 'g', '3175', 's', 'l', 'l', '6811', '1821', '693', '8277', 'q', '8623', 'o']
Example Output: a, c, g, l, m, n, o, p, q, s, w, z

Example Input: ['7187', '7081', 'j', 'i', '3725', '6333', 'h', 'f', '6639', 'r', 'n', '3559', '2785']
Example Output: f, h, i, j, n, r

Example Input: ['r', 'a', '3313', 't', '3095', 'o', 'k', 'i', 'c', '913', '3657', 'j', '7329', 'y', 't', '5979', 'r', 'a', 'a']
Example Output:
a, c, i, j, k, o, r, t, y