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: ['a', '2579', 'f', '6787', '123', '225', '6499', '4419', 'o', '1785', '7981', 'z', 'b', '2441', '2821', 'o', 'k', '2747', 's', 'u', 'q', '3901', '7629', 'k', 'm', 'q', '6577']
Example Output: a, b, f, k, m, o, q, s, u, z

Example Input: ['x', '4283', 'n', 'b', 'g', 'p', '8305', '7781', '5907', 's', '1305', 'w', '8623', 'o', 'c', 'u', '1839', '2869', '7537', 'y', '2395', '5309', 'e', '4059', 'l', '6647', 'p', '9717', 'y', 'y', '3769', '2527', '2981', '5255', '4063', 'j', '4843', 'j', '9355', 'z']
Example Output: b, c, e, g, j, l, n, o, p, s, u, w, x, y, z

Example Input: ['9423', '2283', '947', '7383', '9609', 'l', 'm', '6405', '5361', 'f', '6497', '4811', '189', 'b', '1405', 'y', 's', '7883', '4451', 'u', 'h', 't', '6621', '8845', 's', 'w', 'z', '1221', 'h', '933', 'w', 'z', '8299', '6685', '8815', '8645', '5543', 'z', 'l']
Example Output:
b, f, h, l, m, s, t, u, w, y, z