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: ['w', 'g', '1649', 'a', '2115', '6763', 'r', 't', 'l', 's', 'y', '5659', 'a', 'b']
Example Output: a, b, g, l, r, s, t, w, y

Example Input: ['m', '6537', '4063', '6413', 'k', 'd', '2479', 'p', '2251', 'q', '7079', 'r', 'd', 'p', '3347', '1391', '9847', '4487', 'u', '6951', '5285', '5837', '6747', 'r', 's', 'c', 'x', 'b', 'q', 'y', 'd', '331', '679', 'v', '1919', 'f', 'p', '1267', '3151']
Example Output: b, c, d, f, k, m, p, q, r, s, u, v, x, y

Example Input: ['u', 'u', '1165', 'n', '6747', '7633', 'l', '167', 'k', '4897', 'e', 'x', 'p', '8883', '5647', 'p', '6785', '2465', 'd', 'w', 'o', '6979', 'a', '7925']
Example Output:
a, d, e, k, l, n, o, p, u, w, x