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: ['e', 'n', 'y', 'f', 'l', 'h', '455', 'y', '591', 'm', '9041', 'b', 'b', 'o', '4215', '5009', 'o', 'a', '4369', 'u', '6911', '4825', 't', 'k', '6063', '2939']
Example Output: a, b, e, f, h, k, l, m, n, o, t, u, y

Example Input: ['1985', '729', '169', '1299', 'l', 'z', '6809', '3083', 'w', 'f', '1989', 'z', '889', 'x', 'r', '1601']
Example Output: f, l, r, w, x, z

Example Input: ['8319', '8587', '4619', '9799', 'y', '1053', '8257', 'f', 'p', '2951', '4719', 'e', 'n', '7717', '5037', 't', 'o', 'g', 'i', '8373', '6607', 'a', '4597', '9351', 'g', '715', '5779', 'c', '7261', '2105', 'q', 'd', '1907', 'o', '4165']
Example Output:
a, c, d, e, f, g, i, n, o, p, q, t, y