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: ['7071', 'h', '837', 'z', 'c', '2217', 'c', '6341', '6607', 'g', '3569', 'a', 'h', 't', 'b', 'f', 'g', 'f', 'l', 'b', 'x', 'o', 'r', '8949', '8071', '1507', 'v']

Output: a, b, c, f, g, h, l, o, r, t, v, x, z


Input: Consider Input: ['7073', 'd', 'e']

Output: d, e


Input: Consider Input: ['d', '3021', '5341', 'h', 'g', 'm', 'r', 'm', '1389', 'u', 'w', '8467', '7917', '691', '6487', 'q', '1813', 'x', '5887', 'x', '4617', 'f', 'z', 'i', '4657', '1917', 'i', '5111', 'o', '283', 'k', '6737', 'i', 'a', '5859', 'k', '429', 'm', 'p', 'y', '9813', 'l', 't', 'w']


Output: a, d, f, g, h, i, k, l, m, o, p, q, r, t, u, w, x, y, z