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: ['5431', 'o', 'u', 'l', 'f', 'd', 'r', '1479', '9357', 's', 'v', '6399', 'b', '7937', 't', '8497', 'r', '131', 'h', 'c', 'v', '8879', 'k', 'r', '4687', 'l', '1065', 'r', 'w', 'l', '3305', '461', 'q', 'h', 'b', 'e', 'e', 'w', '5999']
Example Output: b, c, d, e, f, h, k, l, o, q, r, s, t, u, v, w

Example Input: ['3043', 'r', 'm', 'i', '2653', 'i', '1703', '1125', '6299', '4863', 'n', 'h']
Example Output: h, i, m, n, r

Example Input: ['539', 'i', 'e', 'r', '4687', '4483', '6455', '45', 'u', 'x', 'n', 's', '4593', '479', '2883', '7125', 'e', 'e', 'w', 'z', '6985', '9479', 'f', 'e', '527', '6461', 's', 'u', 'n', '8537', '1783', 'u', 'h', 'x', '5971', 'w', '1977', 'j', 'w', '5273', '755']
Example Output:
e, f, h, i, j, n, r, s, u, w, x, z