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]: ['7989', '6897', 'o', 'v', '5687', '2933', 'w', '8207', 'y', 's', 'w', '3013', 'h']
[EX A]: h, o, s, v, w, y

[EX Q]: ['5859', 'x', 'z', 'v', 'l', 'z', 'g', 't', 'x', '341', '7023', '4937', 'b', 'n', 'y', 't', 's', '1369', '4461', 'f', '1315', 'l', '5221', '6583', 'h', 'j', 't']
[EX A]: b, f, g, h, j, l, n, s, t, v, x, y, z

[EX Q]: ['1581', '7427', '6065', '8455', '3185', '1681', 'x', 's', '8777', 'k', '6213', '8941', '7081', 'e', '6729', '9333', 'q', '1311', '4783', 'h', 'w', 'k', 'l', '8447', 'p', 't', 'd', '3099', 'u', 'f', '421', 'n']
[EX A]:
d, e, f, h, k, l, n, p, q, s, t, u, w, x