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', 'c', 'o', 'e', 'n', 'q', 'w', '9475', 'w', '863', 'r', '2219', '3483', '5035', '8209', '7957', 'b', '3735', '1423', 'l', '3409', '7639', 'd']
b, c, d, e, l, n, o, q, r, w

['57', 'j', 'n', '877', 'u', 'w', 'j', 'f', '8977', 'h', '469', '9417']
f, h, j, n, u, w

['a', '449', '8415', '9335', 'z', '8617', 's', 's', 't', '8207', 'c', 'm', 'k', 'v', '1351', 'u', 't', '1793', '2183', 'n', 'f', '8929', '1637', '1009', 'f', 'k', 'f', 'p', 'n', '3659', '7483', 'm', 'm', 'h', 's', '7679', '3611', 'h', 'x', 'r']

a, c, f, h, k, m, n, p, r, s, t, u, v, x, z