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: ['w', 'o', 'l', '5331', 'k', '9325', '6759', '7931', '8185', 'w', 'h', 'h', 'x', '4357', '6845', 'v', 'o', '8401', 'u', 'g', 'f', 'j', 'j', '2493', '4753', 'c', 'm', '1469', '4307', 'm', '2737', 'n', 'y']
Example Output: c, f, g, h, j, k, l, m, n, o, u, v, w, x, y

Example Input: ['d', 'o', '7643', '9065']
Example Output: d, o

Example Input: ['4091', 'y', 'l', 'y', '1377', 'h', '4425', '3807', 'k', '2647', '7409', 'z', '7171', '9857', 'm', 'a', 'b', '4789', 'g', 'p', 'l', 'h', '3259', '5221', '4237', '1223', 'i', 'q', '8589', '5425', 't', '7373']
Example Output:
a, b, g, h, i, k, l, m, p, q, t, y, z