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: ['z', '2519', '4799', '4715', '7165', 'r', 'r', 'l', 'n', '6925', '8935', '9795', '5489', 'v', 'u', '6527', '2241', 'u', 'c', 'w', '9755', 'w', '9823', 'g']

Output: c, g, l, n, r, u, v, w, z


Input: Consider Input: ['p', '5229', '7521', 'y', 'n', 'u', 'c', '4047', '781', 'a', '4707', '7149', 'j', 'm', 't', '515', '7691', 'h', '4879', 'j', '6593', 'n', 'p', '2949', '1343', 'y', '2629', 'p', 'b', 'b', '2861', 'a']

Output: a, b, c, h, j, m, n, p, t, u, y


Input: Consider Input: ['e', 'q', '1457', 's', 'f', 'a', 't', 'h', 'p', 's', '1073', '5105', '1957', 't', '2025', '4887', 'l', '9499', 'd', '639', 'k', 'm', 'e', '7059', 'y', '5435', 'l', 'b', '4355']


Output: a, b, d, e, f, h, k, l, m, p, q, s, t, y