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: ['3611', '6825', 'j', 'e', 'r', 'a', '8889', 'y', 'x', 'k', '2651', '4545', '2289', 'r', 'q', '3163', 'a', 'i', 'j', 't', 'b', '2673', '4307', 'q', '5839', 'w', 'g', '6221', 'g', 'h', 'h', '5815', 'n', '3551', '7709', 'z', '2281', '7987', 'w', 'a', '2319', '3337', '3409']
Example Output: a, b, e, g, h, i, j, k, n, q, r, t, w, x, y, z

Example Input: ['s', 'u']
Example Output: s, u

Example Input: ['d', 'p', 'a', '5483', 'b', 'r', '3461', 't', '7955', '9539', '2369', '3103', 'g', 'h', 'k', '3229', 'm', '3235', 'j', '473', '9661', '943', '2739', '7909', '7161', '1639', '757', 'n', '9123', '2333', 'r', 'h', 'i', 'i', '4415', '6963', 'b', 'w']
Example Output:
a, b, d, g, h, i, j, k, m, n, p, r, t, w