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: ['z', '3219', '6399', '2357', '7597', '357', 'k', 'k', 'u', 'd', '6115', 'w', '2921', '8809']

A: d, k, u, w, z
****
Q: ['l', 'i']

A: i, l
****
Q: ['9379', '8487', '9237', 't', 'k', 'p', 'm', '2589', '1499', '4333', '2993', 'j', '8659', '4157', '2399', '8271', 'o', 'w', 'n', 'a', 'j']

A:
a, j, k, m, n, o, p, t, w
****