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:
['z', 'm', 'n', 'u', '9159', '7931', '5401', '1383', '8195', 't', 'x', 'q', 'r', '2535', 's', 'j', 'c', '8123', '2429', '5581', 'k', 'c', 't', 'i', 'm', 'o', 't', 'q', '4819', 't', '1649', 'r', 'y', 'z', '8813', '7451', '199', 'o', 'x', 's', 's', '6747']

Ex Output:
c, i, j, k, m, n, o, q, r, s, t, u, x, y, z


Ex Input:
['6599', 'f', 'c', '661', 'q', 'e', '1951', 'f', 'f', 'a', 'd', '9521', '853', 'n', 'w', '6451', '5549', 'k', 't', 'l', 'z', 'm', 'k', '567']

Ex Output:
a, c, d, e, f, k, l, m, n, q, t, w, z


Ex Input:
['4425', '8583', 'u', 'u', '5587', 'l', 'j', 'n', '7279', 'i', 'x', 'e', 'q', 'm', '9889', '5619', '4757', 'x', 'q', 'j', '5525', 'x', '5565', 'l', '6569', '6369', 'p', 'b', 'y', 'i', '7353', 'j', '1525', 'g', 'w', '7925', '9055', 'v', 'o', '6241', '549', 'k', 'g', '5981', 'r']

Ex Output:

b, e, g, i, j, k, l, m, n, o, p, q, r, u, v, w, x, y