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: ['7653', 'n', '697', '4565', 't', '7275', '2429', '1365', '7059', 'o', '8053', 'j', '2837', '957', '851', 'z', 'd', 'd', 'y', 'c', '7467', 'o', 'i', '9519', 'q', 'g', '7911', 't', 'g', '3439', '5821', '8433', 'k', 'z', 's', 'g', '685', 'i', 't', 'r', '6881']

Output: c, d, g, i, j, k, n, o, q, r, s, t, y, z


Input: Consider Input: ['4925', 'i', 'q', 'k', '7615', 'r', '7217', 'o', '8097', '9151']

Output: i, k, o, q, r


Input: Consider Input: ['357', 'd', '6651', '1607', '231', '7661', 'j', 'o', '9863', 'r', '4433', '7847', '2651', 'z', '4117', 'r', '3407', '997', 'a', 'y', '4473', '7711', '8723', 'e', 'h', '159', '1345', '5629', '1197', '4879', '1055', 'p', 'w', 'p', '1891', '561', 'z', '6517', 'j', 'n', '6767']


Output: a, d, e, h, j, n, o, p, r, w, y, z