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.

['277', '8697', 'q', '2023', '5723', 'm', '8673', 'f', 'z', 'z', 'a', '9875', 'p', 'x', 'l', 'z', 'x', '619', '6509', 's', '2067', '571', 't']
a, f, l, m, p, q, s, t, x, z

['m', 'z', 'd', '4667', 'v', '2881', '887', 's', '9861', 'd', '8821', '125', 't', '4493', '6749', '2983', '309', '6033', 'i', '3421', 'j', '4001']
d, i, j, m, s, t, v, z

['b', 'x', 'o', 'c', 'v', '9565', '6811', '3255', '2913', '7135', '4153', '2855', '7357', '9093', '7885', '6789', '1757', 'n', '9649', '567', 'g', 'r', 'f', 'e', 'l', '8543', 't', 'c', '9517', '4507', 'w', 'z', '1449', 'a', '3557', 'n']

a, b, c, e, f, g, l, n, o, r, t, v, w, x, z