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]: ['2593', '1835', '5089', 'v', '9723', 'f', '9279', '4257', '2175', '655', 'q', 's', 'v', 'j', 'm', '4471', '6419', '1685', '2793', 'x', '509', 's', '4833', '2125', 'b', '6379', '1075']
[EX A]: b, f, j, m, q, s, v, x

[EX Q]: ['w', 'a', 'm', 'd', '409', 'm', 'v', 's', '7801', 'l', '8551', 'k', '867', 'n', '7731', 'z', '3773', '9137', 'v', 's', 'p', 'p', 'f', 'z', 'g', 'q', 'g', '877', '697', '2057', '8389', '2399', '5263', '2761', '9841', '1781', 'l', '8023']
[EX A]: a, d, f, g, k, l, m, n, p, q, s, v, w, z

[EX Q]: ['5091', 'z', '1255', 'r', 'u', 'x', '3177', 'f', 's', 'a', 'f', '2563', 'w', '8311', '8197', '1819', '3615', '539', 'i', '3425', 'k', '2437', 'h', '7929', 'u', '7417', '2541', 'u', '3073', '3347', '5591', '9839', 'q', '2551', '921', '6187', '9825']
[EX A]:
a, f, h, i, k, q, r, s, u, w, x, z