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: ['4749', '4607', '625', '6907', 't', 'b', '8479', '6505', 'r']
Example Output: b, r, t

Example Input: ['j', 'f', '9567', 'f', '7383', 'k', '599', '1091', '1501', 'y', 'o', 'c']
Example Output: c, f, j, k, o, y

Example Input: ['q', 'j', '9817', '5765', '4569', '7647', 'm', 'c', '6695', 'o', '5943', '7233', '5401', 'x', '5339', 'd', '113', '8461', 't', '6971', 's', '3959', '4185', 'c', '9011', '2789', '9515', 'y', 'v', 'n', '1885', '8965', '7887', '1189', 'r', '9187', '53', 'w', 'j', '2597', 's']
Example Output:
c, d, j, m, n, o, q, r, s, t, v, w, x, y