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: ['k', '1995', 'b', '2581', 'x', '2639', 'i', '6761', '2701', 'd', '6993', '9375', 'r', 'm', '249', '8115', '8179', 't', '4901', 'i', '6197', '2809', 'e', 's', 'j', '4261', 'f', '6649', '7527', '3839', '5651', '9287', 'n', '2505', 's', 'q', '2825', 'g']

Output: b, d, e, f, g, i, j, k, m, n, q, r, s, t, x


Input: Consider Input: ['a', 'g', '7991', 'k', '8271', 'v', '3029', '5211', '4627', 'y', 'y', 'f', '6719', 'a', '3933', 'b', 'l', '8951', 'r', 'l', 'f', 'a', 'a', 'i']


Output: a, b, f, g, i, k, l, r, v, y