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', 'i', '4383', '7667', '9617', 'y', 'a', '8051', 'w', '4857', 'y', '3953', 'u', 'o', 'y', 'i', '9201', 'g', '1807', '5367', 'g', '5263', '3995', '6665', '3113', '9433', '6315', 'm', '845', 'x', 'c', 'v', 'h', '1491', 'g', '3519', 'x', 'b', '7695']
Example Output: a, b, c, g, h, i, m, o, u, v, w, x, y

Example Input: ['o', 'h', 'z', 'n', 'e', 'y', 't', '4371', 'm', '1059', '4853', '8529', 'l']
Example Output: e, h, l, m, n, o, t, y, z

Example Input: ['9451', '4421', '2485', 'c', '8031', '6945', '4365', 'p', '1121', 'o', '5731', '7539', '823', '315', '4559', '4711', '8739', 'u', '3449', 'x', '7501', 'u', '3677', 'l', '2767']
Example Output:
c, l, o, p, u, x