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: ['4637', 'f', '2639', '8623', 'w', 'e', 'k', '5503', 'x', '6633', '7553', '1455', 'u', '1773', 'r', 'u', '1489', 'u', '1303', '9683', 'z', '565', '7041', 'x', 'z', '9431', 'k', 'v', 'j', 'z', '5469', '5665', '4089', '4951', '8263', '5675', '4095', '7745', 'z', '2437', 'd', 'e', 'w']

A: d, e, f, j, k, r, u, v, w, x, z
****
Q: ['7989', '6897', 'o', 'v', '5687', '2933', 'w', '8207', 'y', 's', 'w', '3013', 'h']

A: h, o, s, v, w, y
****
Q: ['4685', '1891', 'u', '9753', 't', '5827', '3987', 'k', 'f', '5557', '453', 'a', 'g', '253', '1905', '9613', '6683', '4311', 'a', 'p', 'e', '2287']

A:
a, e, f, g, k, p, t, u
****