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: ['1223', 'h', 'a', 'o', 'v', '2535', 'g', '6267', 'w', '9625', '7961', '9577', '7611', '5655', 'p', 'j', 's', '2141', '4101', 'l', '4367', '9383', 'n', '5965', '9097', '7571', 'p', 'u', 'x']
Example Output: a, g, h, j, l, n, o, p, s, u, v, w, x

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: ['u', 's', 'i', '9039', 'x', 'u', 'e', '195', '5773', 'h', '7443', 'g', '1835', '6365', '1761', '833', '2905', 'o', 'm', '7859', 'x', '4923', '5685', '8769', '9839', '3671', 'h', '9293']
Example Output:
e, g, h, i, m, o, s, u, x