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: ['2505', '4199', 'e', '5433', '8795', 'q', 'i', '9357', 'o', '257', '8235', 'b', '1339', 'w', '1463', 'm', '277', '3211', '3863', 'r', 'm', 'i', '5793', '7451', '4787', '4739', 'k', 't', 'o', '7453', '9385', 'v', 'l', 'y', 'f', 'r', 'p', 'w']

Output: b, e, f, i, k, l, m, o, p, q, r, t, v, 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: ['9247', 'o', '7017', '1203', '1021', 'c', '9319', '9553', '6495', 'b', '5423', 'o', 'j', '2793', '299', '1277', 'a', 'f', 'p', '2107', 'l', '1841', 'a', 'l', '1781', 'c', '1263', '6463', '1557', '4389', '8545', 'm', '1203', 'a', '9661', '9165', '9169']


Output: a, b, c, f, j, l, m, o, p