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: ['d', '2359', '6571', 'c', 'n', 'u', '9513', '9321', '1689', 'b', '969', '1823', 'e', 'b', '9147', 's', '1811', 'k', '5443', '8699', '5483', 'v', 'w', 'n', '1215']

Output: b, c, d, e, k, n, s, u, v, w


Input: Consider Input: ['p', '2923', 'e', 'k', '5433', '605', '5079', 'k', 'p', 'x', '4845', '4099', '6795']

Output: e, k, p, x


Input: Consider Input: ['5941', '8791', 'o', '5869', 'x', '9725', '2309', '9093', '5609', '1773', '1735', '6933', '1081', 'z', '8979', '9165', 'd', '3567', 'm', 'j', '2279', '8069', 's', 'e', '9757', '1565', 'o', 'c', '7475', 'g', '3879', '3419']


Output: c, d, e, g, j, m, o, s, x, z