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 Input:
['9273', '5219', 'e', '9413', 'v', 'h', '5657', '797', '2303', '2119', '4791', '2757', '4983', 'h', '9681', '4503', '6657', 't', 'i', 'g', '9375', '9901', 'm', 'y', '6461', 'h', '6663', '9493', '5897', '8829', 'd', 'x', '901', '833', 'u']

Ex Output:
d, e, g, h, i, m, t, u, v, x, y


Ex Input:
['w', 'g', '1649', 'a', '2115', '6763', 'r', 't', 'l', 's', 'y', '5659', 'a', 'b']

Ex Output:
a, b, g, l, r, s, t, w, y


Ex Input:
['h', 'a', '6205', 'l', '5907', 'd', 'b', 'l', 'v', 's', 'z', '4497', '1499', '4961', '7817', 'o', '533', 'f', 'g', 'l', '8861', '125', 'c', '5731', '8377']

Ex Output:

a, b, c, d, f, g, h, l, o, s, v, z