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: ['7155', 'y', '145', '7147', 'u', '8453', 'd', '3693', '6471', '5289', 'n', 'p', '8289', '2929', '199', 'e', '8377', '8937', '5315', 't', 'l', '7715', 'c', 'y', 'f', '9999', 'p', '3655', '5489', 'q', '2321', '9881', '2265', 'n', 'v', '455']
Example Output: c, d, e, f, l, n, p, q, t, u, v, y

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: ['9765', 'h', '1813', 'g', 'l', '9781', 's', 'c', '659', '3867', '5719', 'p', '4837', '8601', '3975', '7319', 'b', '3825', '9719', 't', '5919', 'y', 'j', '473', '4409', 'i', '2517', '3675', 'p', 'b', 'e', 'd', '995', 't', 'x', '7959', 't', '5269']
Example Output:
b, c, d, e, g, h, i, j, l, p, s, t, x, y