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]: ['x', 'i', 'r', '6011', 't', 'f', 'b', 'i', '8367', '4051', '1459', 'f', '5583', '9609', 'l', 'q', 'g', '8443', 'o', '8697', '7053', '8325', 'k', '7021', 'q', 'm', '6899', '9981', '8985', 'i', 'j', '8043', 'k', '535', '7603', '7629', 'k', '2779', 'g', '2049', 'x', 'd', '8527', 'k', 'q']
[EX A]: b, d, f, g, i, j, k, l, m, o, q, r, t, x

[EX Q]: ['r', 's', '3409', 'a', 'e', '6855', 'i', 'n', '8655', 's', 't', '8401', 'u', '9603', '8815', 'q', 'a', 'x', 'i', '8455', 'e', '5877', '3917', 'p']
[EX A]: a, e, i, n, p, q, r, s, t, u, x

[EX Q]: ['l', 'l', '8645', 'f', 'x', '2087', 'n', 'l', '935', 'y', '8453', '6925', '7853', 'f', 'b', 'd', '7405', 'w', '4195', '2683', '7399', 'h', 'j', 'n', '6841', 'l', 'r', '7253', '6391', 'b', 'k', 'i', '477']
[EX A]:
b, d, f, h, i, j, k, l, n, r, w, x, y