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.

[EX Q]: ['7595', '5303', '3985', 'n', 'w', 's', 'r', 'f', '8237', 'q', 'y', 'f', '3121', '2463', '4597', 'q', '6801', 'f', 'i', '8563', '3267', 'k', '6157', 'f']
[EX A]: f, i, k, n, q, r, s, w, y

[EX Q]: ['z', '8407', 'y', 'h', '1377', '3511', '1449', 'z', '3991', 'n', 'x', 't', 'h', '6389', '8049', '6091', '7787', 'p', 'l', '5815', 'k', 'e', 's', 'a', '9491', 'w', '1909', '4801', '4725', 'i']
[EX A]: a, e, h, i, k, l, n, p, s, t, w, x, y, z

[EX Q]: ['o', '4735', 'l', 'l', '421', 'i', 'd', '4309', '5665', 'o', '851', '1923', 'm', '8607', '9097', 'l', 'w', '3335', 'u', '5231']
[EX A]:
d, i, l, m, o, u, w