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]: ['r', 'j', '437', 'b', '5223', 'n', 'v', '437', 'd', '8285', 'k', 'j', 'r', 'p', 'n', 'e', 'n', 'j', 'o', '2651', 'j', '6365', 'q', 'q', '2159', 'g', '3641', '7727', 'c', '1197', 's', 't', 'n']
[EX A]: b, c, d, e, g, j, k, n, o, p, q, r, s, t, v

[EX Q]: ['2381', '2865', '4821', 'n', 'u', 's', 'p', 'v', 'v', 'n', '1349', '7903', 'm', '193', 't', 'p', 'c', '3521', 'a', 't', '8281', 'i', '151', '4783', 'm', '3387', '9551', 'z', 'q', 'v', '4549', '4411', 'u', '8735', '2645', '359', '2871', '5923', '5071', 'c', '9843', 'i']
[EX A]: a, c, i, m, n, p, q, s, t, u, v, z

[EX Q]: ['4637', 'l', 'a', '5521', 'a', '4835', 'o', '8253', '5205', 'n', 'l', '709', 'w', 'p', '2411', '7483', 's', '7573', '5129', '8383', '515', 'f', 'z', '1147', 'q']
[EX A]:
a, f, l, n, o, p, q, s, w, z