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]: ['8319', 'f', 'w', 'w', 'v', '6521', '4503', 'b', 's', 'b', '9651', 'k', '4635', '2195', '7537', '6839', 'i', 'd', 'b', '205', 'q', '7333', 'q', '5129', '4921', 's']
[EX A]: b, d, f, i, k, q, s, v, w

[EX Q]: ['h', 'b', '9601', 'h', 'h', 'h', '8099', '8265', 'i', 'd', '8791', 'p', '8059', '4309', '501', '2581', '9837', '157', '4785', '5925', 'q', '8491', '4779', 'r', 'l', 'k', '3679', 'v', 'g', 'g', '9731', '1909', '9783', 'f', '4293', '5009', 'o', '3057', '3157', 'c', '5587', 'b', 'f', 'd', 'k']
[EX A]: b, c, d, f, g, h, i, k, l, o, p, q, r, v

[EX Q]: ['e', '1099', 't', 'm', 'a', '7819', '9685', '6297', 'b', '2419', '4697', '2511', 'i', 'z', 'g', '9499', 'q', '9851', 'd', 'v', '1113', '5251', 'i', '2373', 'f']
[EX A]:
a, b, d, e, f, g, i, m, q, t, v, z