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: ['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', '165', 'm', '9975', '9259', '6505', 'a', 'g', 's', '1127', 'h', 'n', 'c', '6475', 'c', '8657', 'a', '4057', 'm', 'y', 'w', 'm', '6567', '7297', '285']

Output: a, c, f, g, h, m, n, s, w, y


Input: Consider Input: ['4393', '6057', 'g', 'k', 'd', 'u', '5975', '8759', 'e', '8421', '7175', 'n', 'e', 'p', 'c', 'y', 'b', '7297', '2499', 't', '7899', 'x', '7731', '9423', '4217', '3315', 'e', 'n', 'm', 'r', 'c', 'q', 'e', 'w', '8759', 'p', '1887', '7137', '9061', '359', '321', 'd', 'n', '8643', '3909']


Output: b, c, d, e, g, k, m, n, p, q, r, t, u, w, x, y


