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]: ['f', 't', '2135', '8397', '6361', '389', '2253', 'x', 'p', '4833', '5785', 'x', '1811', '9639', '5739', '175', '3231', '5931', 'r', 'c', 'g', 'h', 'p', '909', 'p', '587', 'a', 'a', 'h', 'q', 's', '5945', '4911', 't', 'h', '7517', 'p', '3177', 'h', 'u', '3577', '7055', 'l']
[EX A]: a, c, f, g, h, l, p, q, r, s, t, u, x

[EX Q]: ['s', '6723', 'l', '1573', '1129', 'n', '4277', '5003', 'y', '7563', 'c', '6747', '3105', 's', '3593', '8417', '8253', '4157', 'w', 'f', 'z', 'd', '9685', '1033', 'h', '4893', 't', 'j', '6821', 'z', 'a', 'u', '591', 'o', '1087', '2147', '1223', '2339', 'i', 'y', '9307', 'x', 'z', 'r', 'y']
[EX A]: a, c, d, f, h, i, j, l, n, o, r, s, t, u, w, x, y, z

[EX Q]: ['3539', 'i', '4801', '6615', '6851', '2351', '1861', 'i', 's', 'q', '5141', 's', '5841', 'e', '6571', '5123', 'm', 'a', '8525', 'x', 'u', 'x', '6289', 'q', 'h', 'r', '6713']
[EX A]:
a, e, h, i, m, q, r, s, u, x