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.

[Q]: ['4269', '1847', '2025', '601', 'g', 'n', 'h', '3499', '4977', '3579', '9355', '3489', 'm', 'm', '4401', '4605', 'l', '3977', 'h', 'd', 't', '5135', '7787', 'k', 'q', '7699', '5325', '6269', '1865', 'h', '8915', '5677', 'g', '603', '1435']
[A]: d, g, h, k, l, m, n, q, t


[Q]: ['5973', 'h', '4081', 'i', '8059', 'w', 'j', '6175', 'w', '8685', '5811', 'k', 'n', '5577', '9817', 'v', '8617', 'u', 'y', '3921', 'b', '1027', '5405', 'a', '3501', '6659', 's', 'e', '157']
[A]: a, b, e, h, i, j, k, n, s, u, v, w, y


[Q]: ['r', 'u', '1289', '7099', 's', '4159', '8655', 'a', 'g', '5157', 'x', 'e', 'g', 'z', '1033', '9005', '6205', 's', 'y', 'e', '9203', 'z', 'n', '3793', 'e', 'b', '8713', '6867', '7743', '2007', '2165', 'f', '2621', '579', '1521', '1543', 'l', '4709', 'z', '7881', '9041', '705', '2245']
[A]:
a, b, e, f, g, l, n, r, s, u, x, y, z