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: ['8829', 'm', '5369', 'q', '5737', '7799', '5705', 'p', 'w', '1983', '4849', 'h', '6771', 'p', 'y', '1071', 'u', '6401', '7723', 'p']

Output: h, m, p, q, u, w, y

Input: Consider Input: ['7065', 'q', 't', '3177', '9035', 'i', 'l', 'd', '8961', '1183', '6507', 'u', 'c', 't', '2467', '7659', 'e', '8963', 'j', 'g', 'p', '6779', '7115']

Output: c, d, e, g, i, j, l, p, q, t, u

Input: Consider Input: ['6697', 'w', 'g', '6965', '4123', '3567', 'q', '9469', '2735', 's', 'c', 'p', '2577', '7719', '8257', 'n', 'd', '8213', 'c', '145', '4035', '8737', 's', 'l', 'y', 'z', '1423', 'v', '5855', '3493', 'l', '4569', '5871', 's', '6731', '1617', 'c', 'w']
Output: c, d, g, l, n, p, q, s, v, w, y, z