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: ['5163', 'n', 'j', '67', '3801', 'n', '7113', 'z', '579', '6885', '8921', 'v', '5481', '5507', 'k', '8403', 'c', '837', 'u', '6341', 'd', 'i', '497']

Output: c, d, i, j, k, n, u, v, z


Input: Consider Input: ['8815', 'w', '8629', 'y', '3891']

Output: w, y


Input: Consider Input: ['271', '1361', 'o', '8801', 't', 'b', 'n', 'w', 'n', 'j', 'f', '451', '5761', '2973', 'h', 't', 'w', '9985', '6015', 'i', '2933', '1311', 's', 'j', '6185', 'h', 'r', '2723', '7591', 'j', '6655', '4643', '6595', '7673', 'h', '8617', '629', '5107', 'q', '3653', 't', '3547', '2255', 'i']


Output: b, f, h, i, j, n, o, q, r, s, t, w