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: ['4397', '2685', '9539', '4343', '6697', '7693', 'g', 'c', '3587', '4691', 'j', '8931', '7397', '2103', '3431', 'u', 'l', 's', 'v', 'q', 'd', '1289', 'h', '1695', 'h', 'j', 'e', '1225', 'e', '7893', 'o', 'i', '3351']

Output: c, d, e, g, h, i, j, l, o, q, s, u, v


Input: Consider Input: ['z', '5601', '5675', 'w', 's', 'z', '9213', '9563', '1699', 'p', 'g', 'm', 'c', '9279', '4481', 'p', 'n', '2389', 'c', '503', '1901', '8827', '1701', '1607', '5633', 'a', 'z', 'g', '3175', 's', 'l', 'l', '6811', '1821', '693', '8277', 'q', '8623', 'o']

Output: a, c, g, l, m, n, o, p, q, s, w, z


Input: Consider Input: ['f', '9765', 'x', 'y', '3603', '4197', 'l', 'f', '6875', 'x', '3423', 'z', '1347', 'f', '787', 'm', '1037', 'i', '5081', '287', 'g']


Output: f, g, i, l, m, x, y, z