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.

['1345', 'y', '7221', 'h', 'r', '3255', 'k', 'r', 'j', '8639', '467', 'f', 'k', 'n', 'k', 'j', 'l', 'w', '143', 'w', 'q', '5657', '589']
f, h, j, k, l, n, q, r, w, y

['1449', 'a', '6261', '303', '4651', 'n', 'u', '1595']
a, n, u

['a', 'w', '2831', '5261', 'z', 'd', '2563', 'n', 'b', 'k', 'w', 'z', 'e', 'j', 'o', '9755', '6781', 'h', 'l', 'm', '7197', '3215', 'w', '4913', '2193', '1323', 'j', 'l', '2721', 'y', '7323', '9165', '8905', 'b', '9383', 's', 'l', 't', '5279', '2241', 'f', '4901', '3823', '1563']

a, b, d, e, f, h, j, k, l, m, n, o, s, t, w, y, z