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.

Input: Consider Input: ['x', 'j', '9747', 'i', '2015', '3505', 'q', 'n', 'h', '3011', 'u', '8043', 'j', 'f', 'd', 'a', 'p', '5817', 'l', 'q', '2275', 'n', '7085', '5373', 'l', 'g', 'b', '8043', '3085']

Output: a, b, d, f, g, h, i, j, l, n, p, q, u, x

Input: Consider Input: ['5553', 'f', '3881', '8867', 's', 'd', 'a', '375', '7889', '3949', '2905', 'w', 'q', 'q', 'd', '4203', 'i', '2601', 'y', 'p', 'k']

Output: a, d, f, i, k, p, q, s, w, y

Input: Consider Input: ['2979', '2049', 'b', '769', 'n', 'k', 'm', 'h', 'y', 'k', '285', '8515', 'c', '6639', 'n', 'j', 'n', 'l', '4621', '683', '7635', 'f', '2533', '6457', 'i', 'x', 'h', '6133', 'i', 'e', '1601', 'b', '6889', 'm', 'h', '1647']
Output: b, c, e, f, h, i, j, k, l, m, n, x, y