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: ['8005', 'q', 'w', 'a', 'f', 'o', '6017', '7591', 'm', 'p', 'z', 'q', 'u', 'o', 'd', '6043', 'f', '3575', 'r', '2885', 'o', '3141', '621', '2375', 't', '5397', 'h', 'b', 'i', '3785', '1551', 'i', '8879', 'g', '5237', '7111', '2057', '1743', '9895', '2613', 'i', 'z', '677']

Output: a, b, d, f, g, h, i, m, o, p, q, r, t, u, w, z


Input: Consider Input: ['x', 'i', 'k', 'c', 'f', '3057', '481', '5887', '847', 'c', 'x', 't', 'g', '5805', 'a', 'i', '2885', '403', 'x', 'c', '4815', '2765', 'c', '5181', 'l', 'e', '3843', '1171', 'u', '7867', 'z', 'e', '9349', '5011', 'h', 'x', '3193', 'i', '4595', '8621', '6007', '1879']

Output: a, c, e, f, g, h, i, k, l, t, u, x, z


Input: Consider Input: ['5695', '9387', '2749', 'r', 'd', '1423', 'g', 'e', '4981', '9289', 'w', '1291', '9999', '8921', '5261', 'o', 'j', '9603', '6601', 'b', '9521', 'm', '5571']


Output: b, d, e, g, j, m, o, r, w