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: ['8051', 'h', 'g', 's', 't', 'p', 'w', 'x', 's', '8521', 'm', '9719', 'j', 'n', 'i']
Example Output: g, h, i, j, m, n, p, s, t, w, x

Example Input: ['h', '1797', '8211', 'n', 'r', '7707', '2063', '4655', 'x', '5521', '8327', 'g', '7659', 'i', 'x', 'w', '9465', '4625', 'q', '5377', 'r', '225', 'r', 'i', 'e', '4163', 'g', 'g', '3537', 's']
Example Output: e, g, h, i, n, q, r, s, w, x

Example Input: ['4613', '6343', '1347', '8939', 'c', 'y', '6789', '2765', 'f', '5647', '647', 'k', '6643', 'z', 'r', 'n', 'w', 'n', 'b', 'k', 'q', '7245', '7121', '6627', 'h', '3427', '5735', 'l', '7453', '4693', '5233', '3839', '833', 'q', '501', 'a', '3753', 'v', 'w', 't', 'g', '4849']
Example Output:
a, b, c, f, g, h, k, l, n, q, r, t, v, w, y, z