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: ['f', '217', '449', 't', 'j', '4097', '5561', '8317', '647', 'u', 'b', '7833', 'r', '9011', 'z', '2753', '2183', 'z', 'o', 'g', '7541', 'b', '8795', '327', 'v', 'e', 't', 'l', '4909', 'k', '7681', 'r']
Example Output: b, e, f, g, j, k, l, o, r, t, u, v, z

Example Input: ['l', '6819', '1029', '2925', '2361', '5545', '2151', '2681', 'f', 'p', '1263', '2875', 'b', '4665', 'f', 'g', 'p', '4829', '8453', 'z', 'l', '4219', '7517', '25', 'a', '5099', '3693', 'i', '1815', '1541', 'g', '7665']
Example Output: a, b, f, g, i, l, p, z

Example Input: ['o', 'y', 'a', '2561', 'j', '3521', 'a', 'g', '3959', '3197', 'p', '9353', 'k', '7955', '363', '1535', '7589', '3893', '8459', '2701', 'z', 't', 'i']
Example Output:
a, g, i, j, k, o, p, t, y, z