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

['2313', '2073', 'd', 'e', 'o', '793', '4999', 'f', 'c', '4473', '4519', 'u', 'n', 'k', '69', '475', 'a', 'j', 'q', 'x', '5869', '9523', 'z', 'v', '9265', '5989', 'p', 'm', 'g', 'y', 'b']
a, b, c, d, e, f, g, j, k, m, n, o, p, q, u, v, x, y, z

['1405', 'r', 'c', 'm', 'c', '1391', '5331', '3225', '4005', '2459', 'b', '8111', '6983', '8215', 't', 'd', '343', 'd', 'v', '8747', '1877', '3347']

b, c, d, m, r, t, v