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: ['w', 'g', '1649', 'a', '2115', '6763', 'r', 't', 'l', 's', 'y', '5659', 'a', 'b']

Output: a, b, g, l, r, s, t, w, y


Input: Consider Input: ['3995', 'n', 'z', '8389', '7857', '3005', 'i', 'e', '1117', 'z', '8251', 'r', 't']

Output: e, i, n, r, t, z


Input: Consider Input: ['i', '8703', 'x', '5773', '513', '8875', '6923', '9437', '7825', 'm', 'w', 'w', '5767', 'f', 'p', 'b', 'e', 'q', 'q', 'y', '2067', '5673', 'j', 'o', 'f', '5123', 'j', 'i', '2157', '4445', 'l', '7809', '221', '4995', 'b', '1005', '1691', 'a', 'd']


Output: a, b, d, e, f, i, j, l, m, o, p, q, w, x, y