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]: ['3611', '6825', 'j', 'e', 'r', 'a', '8889', 'y', 'x', 'k', '2651', '4545', '2289', 'r', 'q', '3163', 'a', 'i', 'j', 't', 'b', '2673', '4307', 'q', '5839', 'w', 'g', '6221', 'g', 'h', 'h', '5815', 'n', '3551', '7709', 'z', '2281', '7987', 'w', 'a', '2319', '3337', '3409']
[EX A]: a, b, e, g, h, i, j, k, n, q, r, t, w, x, y, z

[EX Q]: ['r', 'n', '7583', '8697', '7927', 'l', '5003', '1363', 'p', 'e', 'q', '6227', '6915', '8619', '9011', 'n', '3063', '3799']
[EX A]: e, l, n, p, q, r

[EX Q]: ['8681', 'j', 'y', 'g', 'k', '2183', '2481', '7617', 'w', '7521', 'r', '6685', 'f', '225', 'w', '5317']
[EX A]:
f, g, j, k, r, w, y