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.

['z', 'l', 's', 'f', 'j', 'x', '1125', 'd', '37', '5009', '9187', 'b', '8683', '8841', 'y', '9955', '1571', 'm', '347', '3679', '5797', '2133', 'g', 'u', '9817', '6347', '2067', '1927', '167', '4215', '45', 't', 'd', '6599', '4751', 'g', 'l', 'u', '7881', 's']
b, d, f, g, j, l, m, s, t, u, x, y, z

['m', '3809', 'l', 'k', '1929', '7963', 'n', 'u', '2125', 'g', 'o', '8325', 'o', 'h', 'y', '3025', 'e', 'e', 'c', 'x', '8445', '4979', 'z', 'f', '4201', '4765', 'g']
c, e, f, g, h, k, l, m, n, o, u, x, y, z

['y', 'v', '1263', '8631', 'm', 'a', '4753', '8879', 'q', '7745', 't', '3455', 'l', '9531', 'x', '3977', 'v', 'g', 'f', 'a', 'v', '7229', 'h', '2481', 's', 'c', '177', '3407', 'k']

a, c, f, g, h, k, l, m, q, s, t, v, x, y