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]: ['z', 'm', 'n', 'u', '9159', '7931', '5401', '1383', '8195', 't', 'x', 'q', 'r', '2535', 's', 'j', 'c', '8123', '2429', '5581', 'k', 'c', 't', 'i', 'm', 'o', 't', 'q', '4819', 't', '1649', 'r', 'y', 'z', '8813', '7451', '199', 'o', 'x', 's', 's', '6747']
[EX A]: c, i, j, k, m, n, o, q, r, s, t, u, x, y, z

[EX Q]: ['5973', 'h', '4081', 'i', '8059', 'w', 'j', '6175', 'w', '8685', '5811', 'k', 'n', '5577', '9817', 'v', '8617', 'u', 'y', '3921', 'b', '1027', '5405', 'a', '3501', '6659', 's', 'e', '157']
[EX A]: a, b, e, h, i, j, k, n, s, u, v, w, y

[EX Q]: ['5437', 'r', 'j', 'z', '2755', '5043', '463', 'g', '2567', '105', 'g', '4477', '8095', '6095', 'y', '6411', '9735', '3455', 'v', 'i', 'e', '5657', '7131', 'e', '3465', '5919', 'c', 'a', '2047', '2375', 'v', '8277', 'r', '5841', 'j', '4099', '7723', 'x', 'c', '7339', '1117', 'm', 'v', '9865']
[EX A]:
a, c, e, g, i, j, m, r, v, x, y, z