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.

Q: ['9833', '3383', 'h', '3545', '2899', 'y', 'p', 'q', '1901', '3317', '5641', 'v', 'c', 'u', '5521', 'e', '7997', '2439', '5573', '4119', 'k', '8291', '1009', '8253', '405', '233', 'p']

A: c, e, h, k, p, q, u, v, y
****
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']

A: b, f, g, h, j, l, n, s, t, v, x, y, z
****
Q: ['7969', '4821', 'h', '8525', 'w', 'v', 'c', '7899', 'w', 'r', 'i', 't', '3577', 'p', 'u', 'v', '4083', '2241', 'j', 'l', 'v', 'z', 'c', '8839', '691', 'l', 't', '6485', 'd', 'y', '5067', 'd', '4755', '3389', '1373', '6285', '5313', '4797', 'x', 'e', 'q', '8337', '5341', 'o', '1055']

A:
c, d, e, h, i, j, l, o, p, q, r, t, u, v, w, x, y, z
****