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: ['p', 'g', 'q', 'e', '8045', '9999', '9555', '7995', '7195', 'z', 't', '5223', '3699', 'i', '4797', '3817', 'x', 'y', 'w', 'o', '8915', '7803', 'n', '1117', 'c', '9647', 'p', 'e', '9669', '4845', '9255', '4545', '3693', '6871', 'w', '4327', '3285', 'k', 'f', 'x', 'i', 'b', '5967', '6601']
Example Output: b, c, e, f, g, i, k, n, o, p, q, t, w, x, y, z

Example Input: ['t', 'a', '2481', '2841', 'a', '2871', 'm', '4435', 'g', '8201', '4351', '9045', 'o']
Example Output: a, g, m, o, t

Example Input: ['u', '1515', 'x', 'v', '5003', '9333', '8657', '4083', '3189', 'h', '5083', '1557', 'j', 'c', 'u', '2925', '6769', 'b', 'b', 'r', 'l', 't', '8081', 'x', '4635', '6139', 'q', 'o', 'y']
Example Output:
b, c, h, j, l, o, q, r, t, u, v, x, y