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: ['y', 'u', 'c', '5909', 'x', '9865', 'e', 'h', '5125', '4719', 'w', '8855', 'i', 'd']

A: c, d, e, h, i, u, w, x, y
****
Q: ['3561', 'd', '9697', 'd', '7761', 'a', '2833', 'c', '2921', 't', '691', 'g', '4797', 'b', '3913', 'f', 'q', '7807', 'j', '3577', 'j', '1775', '2897', '2589', '993', '8595']

A: a, b, c, d, f, g, j, q, t
****
Q: ['6071', 's', 'z', 'n', 'u', '2675', '3621', 'g', '4275', 'm', 'e', '1291', '827', 's', '5603', '4435', 'c', 'a', 's', 'm', '3241', '509', '8073', '4963', 'y', '6715', 'u', 'k', '2389', 'q', '6477', 'i', 'h', '7585', 'q', '5761', '9149', 'h', 'z', 'y', '8639', '1079', 'k']

A:
a, c, e, g, h, i, k, m, n, q, s, u, y, z
****