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: ['2459', '3709', 'f', '8673', '9313', 'm', 'd', 'g', 'c', 'g', 'u', 'f', 'p', 'i', '8771', '3613', '9669', '6221', '1211', '8331', '2295', 'b', 'f', 'm', '1377', '9831', '1751', 'k', '4831', 'm', '2747', '3435', '4543', 'c', '1729', 'e', '7093', '397', 'm', '383', '2019']
Example Output: b, c, d, e, f, g, i, k, m, p, u

Example Input: ['k', 'c', 'i']
Example Output: c, i, k

Example Input: ['p', '5605', '7627', '6459', 'c', '3207', 'd', '1175', '2371', 'v', '2097', 'q', 'e', '7439', 'e', 'k', 'h', '7711', '2955', 's', 'e', '1713', '6189', 'r', 'v', 'i']
Example Output:
c, d, e, h, i, k, p, q, r, s, v