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', '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]: ['c', 'h', '8655', 'r', '7531', 's', 'r', 'w', 'e', 's', 'p', '1709', '5447', 'b', '5855', 'w', 'f', 'i', '7809', 'q', '1975', 'z', '4037', 'k', 'l', 'z', 'g', '9739', '8801', '3405', '6549', '4561', 'd', '1669']
[EX A]: b, c, d, e, f, g, h, i, k, l, p, q, r, s, w, z

[EX Q]: ['7431', 'f', 'j', '8799', '5211', '9243', '627', 'q', '7373', 'r', 'f', 'q', '3525', 'z', '5459', 'u', '2351', 'z', 'w', '331', '5927', '921', 'g', '3053', '8723', 'w', 'y', 'w', 'l', '3347', 'z', 'h', '8541', '2401', 'o', '8627', 'x', 'y']
[EX A]:
f, g, h, j, l, o, q, r, u, w, x, y, z