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: ['9467', 'o', '8347', '7125', '7999', '1737', 'h', '7043', '8617', '2033', '9959', '2349', 'p', '9389', '5525', 'w', 'u', 'p', '4703', '9807', 's', 'f', '2359', '7357', '2471', '5447', 'f', 'w', '2865', '6627', '3211', 'y', '23', 'z', 's', '1517', '3553', 'r', '2251']

A: f, h, o, p, r, s, u, w, y, z
****
Q: ['u', '635', '5249', '9457', 's', '9317', '9407', 'l', 'w', '9705', 'k', '429', '5489', 'e', 'd', '2457', 'o', '4665', '1675', 'l', 'y', 's', 'o', 't', '4285']

A: d, e, k, l, o, s, t, u, w, y
****
Q: ['m', '5847', 'm', 'w', '8777', 'v', '5773', 'r', '4771', '5757', 'i', 'c', 'o', 'r', '7879', '6947', '9103', '1961', '9811', 'd', '6799', '9227']

A:
c, d, i, m, o, r, v, w
****