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', 'y', 'c', '3211', '9245', '8459', '8521', '5781', 'w', 's', 'd', '5299', 'a', 'y', 'g', 'm', '6435', '8605', 'e', 'h', '6871', 's', '387', 'l', '5829', 'e', 'd', '9545', '2945', 'k', 'v', 't', '8449', '2199', 'm', '2599', '1489', '6623', 'x', 'l']
[EX A]: a, c, d, e, g, h, k, l, m, r, s, t, v, w, x, y

[EX Q]: ['163', 'x', 'g', '5997', 'm', 'l', '7225', '7907', '375', 'y', 'a', 'j', 'c', 'j', '7755', '147', 'h', '3845', 'y', 's', 'h', 'u', '8737', '6091', 'j', 'f', 'c', '7395', '881', '1771', 'y', '3691', 'h']
[EX A]: a, c, f, g, h, j, l, m, s, u, x, y

[EX Q]: ['3725', '3151', 't', 'k', '8581', 'f', 'l', 'j', 's', '9091', '8489', 'a', 'o', '3889', 't', 'n', '2619', 'i', '5265', '531', 'p', '3177', 's', '3481', 'x', '8697', '2971', 'b', 'r', 'r', '1843', 'j', '3975', 'j', 'f', 'n', '829', 'a', 'c', 'd', '321', 'h']
[EX A]:
a, b, c, d, f, h, i, j, k, l, n, o, p, r, s, t, x