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.

Input: Consider 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']

Output: c, d, e, f, l, n, p, q, t, u, v, y


Input: Consider Input: ['p', '3981', 'e', '5949', 'p', '4075', '1919', 'w', 'r', '8059', '4303', 'f', '5201', '2255', '2737', '7395', '8809', 'j', 'z', 'n', '4797']

Output: e, f, j, n, p, r, w, z


Input: Consider Input: ['7901', 'p', '753', '1023', '3581', 'g', '4947', '2703', '3001', '2745', '3821', '1599', 'a', 'c', '4557', '7387', '9525', '2181', '7279', '969', 'f']


Output: a, c, f, g, p