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: ['i', 'y', '8339', 'd', 'b', '7471', '6577', '9037', '4503', '6287', '1439', '8863', '9201', '2661', 'x', 'l', 'v', 'w', 'a', 'f', '8885', '519', '7631', 'g', '7203', '8605', '2429', '9165']

Output: a, b, d, f, g, i, l, v, w, x, y


Input: Consider Input: ['8739', 'v', 'm', '6277', 'l', 's', '109', '8057', '3835', 'd', 'u', 'f', 'w', 'd', 'p', '7705', '3643', '4455', 'u', 'p', 'u', '9407', 'g', 'w', '595', 'z', '6827', '6879', 'w', 'w', '6973', 'm', 'e', '1553', 'v', '3529', '8953', '3903', '5713', '8249', 'e', '1113', 'b', 't', 'r']

Output: b, d, e, f, g, l, m, p, r, s, t, u, v, w, z


Input: Consider Input: ['3693', '6997', 'r', '6447', '6387', 'f', '9319', 'y', 'q', '8105', 'e', '1813', 'g', '5661', '8663', 'b', 'r', '1275', 'c', '1345', '3525', 's', '3553', '27', '3345', 'f', 'p', 'g', '867', 'r', '3807', 'a', '9709', '9447', 'k', 'd', 'n', '2147']


Output: a, b, c, d, e, f, g, k, n, p, q, r, s, y