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: ['l', '6313', '3199', 'w', '249', '8747', '7391', '3871', '173', 'x', 'o', '8647', '4413', '3645', '6123', '701', 'q', '2147', '4289', '7333', '533']
Example Output: l, o, q, w, x

Example Input: ['n', 'h', 'h', 'e', 'p', '1265', '4853', '9433', '1227', '1619', '6381', 'o', '8285', 'k', 'u', '7471', 'm', '6887', '6579', '5813', '5563', '8535', 'n', '3743', 'h', 't', '4497', '2791', 'e', 'v', '6769', '7969', 'x', 't', 'x', 'q']
Example Output: e, h, k, m, n, o, p, q, t, u, v, x

Example Input: ['p', '7493', 'a', '7437', '1025', '7183', '9417', '9809', 'b', '7161', 'z', '635', '3039', 'd', 'p', 'r', '9045', 'a', 'f', 'j', 'y', '6335', '2879', 'x']
Example Output:
a, b, d, f, j, p, r, x, y, z