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: ['1627', 'r', '2429', 'b', '4451', 's', 'k', 'm', '269', 'l', '709', 's', 'q', '985', 'x', 'j', 'k', 'k', '6603', 'v', '9497', '477', '5803', 'c', 't', 'f', '3189', '6419', '8561', '5709', 'u', 'z', '5717', '9711', 'w', 'y', 'm', 'v']

Output: b, c, f, j, k, l, m, q, r, s, t, u, v, w, x, y, z


Input: Consider Input: ['7065', 'f', 'k', 'i', 'd', '8291', 'z', 'e', 'q', '5345', 'h', '3397', 's', '5355', 's', '9033', 'e', '5241', '5285', 'm', 'h', 'i', 'n', '6471', '3365', 'f', 'r', '6145', 't', '4869']

Output: d, e, f, h, i, k, m, n, q, r, s, t, z


Input: Consider Input: ['d', '8667', '4551', 'y', 'i', 'x', '3863', '3293', '3689', '8799', 'g', 'g', '415', 'p', 'q', 'f', 'p', '6143', '9793', 'l', 'b', 'n', 'b', '8931', '9529', 'm', '5265', '381', '3367', '993', '5513', '3075', 'm', 'n', '4709', 'r', 'o', 'x', '4891']


Output: b, d, f, g, i, l, m, n, o, p, q, r, x, y