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

['9923', 'x', '1901', 'v', '1459', '7503', '3829', '4929', 'k', 'c', '3329', '8793', 'n', 'a', '7249', 'b', 'l', 'l', 'm', 'p', 'b', 'a']
a, b, c, k, l, m, n, p, v, x

['1417', 'v', 't', '1873', 'e', 't', 'n', '3521', '8883', '4007', 'i', 'y', 'x', 'x', 'v', 'j', 'q', 'q', '5505', 'e', '2559', '6283', 'a', '2949', '8183', 'f', '6191', '925', 'd', '1215', 'l']

a, d, e, f, i, j, l, n, q, t, v, x, y