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.

['4905', 'w', '3143', '2217', '573', '1073', '63', 'a', '3971', '2887', '3485', 'y', '3893', '1059', '7623', 'x', 'd', '2991', 'e', 's', '735', 'm', 's', '257', 'x', '5559', '97', 'p', '7237', '693', '7229', 'd', '2311', '807', 'd', 'l', '1247', 'l', '359']
a, d, e, l, m, p, s, w, x, y

['w', '1081', 'n', '2073', 't', '6351', '5591', 'a', '113', 'w', 'q']
a, n, q, t, w

['j', 'y', '1649', 'b', '7569', '6469', '8909', 'u', '237', '9187', 'b', 'm', '4465', 'm', '7507', '3499', 't']

b, j, m, t, u, y