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: ['u', '1343', 'd', 'c', '9567', 'e', 'd', 'y', 's', '4199', '3217', '2937', '9345', 'd', 'l', '9875', '5987', 'p', '2585', '5843', '9643', '2423', 'e', 'l', 's', '3503', 'b', 'w', '9685', 'p', '6055', 'k', 'e', 'e', 't', '865', '6071', 'j', '3439', 't']

Output: b, c, d, e, j, k, l, p, s, t, u, w, y


Input: Consider Input: ['9555', '5983', '1853', 'c', 'z', 't', 'p', '9041', 'd', '5919', '1621', '345', 's', '2647', '4261', '8611', 'w', 'x', 'p', '9103', '2599', '5101', '9261', 'k', '7437']

Output: c, d, k, p, s, t, w, x, z


Input: Consider Input: ['8401', 'c', 'b', '5703', 'w', '5957', 'i', 'r', 'n', '6451', 'v', 'i', '4449', '5729', '1331', '8289', '1447', '8213', '399', '2703']


Output: b, c, i, n, r, v, w