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: ['p', 'f', 'h', '1977', '6221', 'i', 'a', 'l', '5225', '8059', 'c', 'w']
Example Output: a, c, f, h, i, l, p, w

Example Input: ['5039', '2227', 't', 'o', '3313', 'm', 'v', '637', '6773', 'v', 'c', 'l', 'y', 'u', '3823', '9669', 'k', 'h', '3589', 'b', 'i', '3833', 's', 'm', '8201', 'u', '3143', 'k', '4111', '9769', '425', '4339', '209', 'c', 'c', '669', '8201', 'u', '7443', '2387', '6919', 'b', 'b', '2873']
Example Output: b, c, h, i, k, l, m, o, s, t, u, v, y

Example Input: ['1659', '2301', 'n', '929', 'f', 'c', '4283', '5429', 'j', 'y', 'j', '3965', 'w', '1081', '8917', '5717', '6639', '6979', 's', 'o', 'q', 'p', 'l', 'b', '1813', '5537', 'n', '2713', '1263', '8927', '3159', '2361', 'x', 'h', 'g', 's', 'j', '4277', 'h', '3397', '9117', 'n', 'e', '2381']
Example Output:
b, c, e, f, g, h, j, l, n, o, p, q, s, w, x, y