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.

['2741', '2541', '8943', 'l', '4047', '2211', 'p', 'e', 't', '7645', '9771', 'f', '5063', '2303', '6097', '5089', 'd', 'e', '1409', '3125', '2171', 'g', '1247', '4045', 'v', 'h', 'u', '2587', '5207', '5553', 'g', 'd', '6891', 'e', '2471', '2435']
d, e, f, g, h, l, p, t, u, v

['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']
b, c, d, e, k, n, s, u, v, w

['9725', 'x', 'j', '6045', 'c', '5691', 's', '5123', '3627', '2655', '9431', '4343', 'u', 't', '4567', '7601', 'k', '8669', '1689', 'r', 's', 'z']

c, j, k, r, s, t, u, x, z