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: ['j', 'y', '9907', 'a', '5715', 'l', '9817', '1949', '2697', '2255', '9571', '8957', '9329', '6055', 'z', 'q', '1185', '4593']
Example Output: a, j, l, q, y, z

Example Input: ['477', '3931', 'g', '5967', 'm', '9845', '1607', 'a', '1749', 'k', 'j', '7945', '9125', 'v', 'n', 's', '5185', '1117', '17', 'x', '4149']
Example Output: a, g, j, k, m, n, s, v, x

Example Input: ['m', '2743', '6199', 'd', '6557', '25', '5115', 'w', 'l', 'j', 'f', '6333', 's', 'c', '1173', 'w', 'w', 't', 'c', 's', 'a', '1167', '3253', 'u', 'v', '7373', 'b', 'n', '9101', '4959']
Example Output:
a, b, c, d, f, j, l, m, n, s, t, u, v, w