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: ['8319', 'f', 'w', 'w', 'v', '6521', '4503', 'b', 's', 'b', '9651', 'k', '4635', '2195', '7537', '6839', 'i', 'd', 'b', '205', 'q', '7333', 'q', '5129', '4921', 's']

Output: b, d, f, i, k, q, s, v, w


Input: Consider Input: ['6643', '6757', 'h', '1033', 's', 'c', '2003', 'p', '5483', 'f']

Output: c, f, h, p, s


Input: Consider Input: ['u', '3989', 'h', '5843', '3505', '9057', '8485', 'l', '7421', 'v', 'f', '5151', '9353', '6807', '9935', 'r', 'z', 'j', 'y', 'd', '235', '8951', 'n', 'w', '3707', 'b', 'n', '75', '25', '2949', 'c', 'g', '3283', 'i', 'j', 'z', '3027', '163', 'b', '6025', '8865', 'm', '43', '639', 'p']


Output: b, c, d, f, g, h, i, j, l, m, n, p, r, u, v, w, y, z