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: ['8301', 'd', 'p', 'l', 'm', '9099', 'o', '8045', 'e', 's', 't', '8853', 'v', '6375', 'q', '2505', 's', '4219', '3587', 'g', '651', '7129']

A: d, e, g, l, m, o, p, q, s, t, v
****
Q: ['1593', '8165', 'q', '6689', 'b', 'r', '373', 'g', '6505', '415', '495', 'j', 'j', 'f']

A: b, f, g, j, q, r
****
Q: ['n', '803', 'w', '6921', 'g', '8277', 'p', 't', '3867', 'n', '6533', 'h', 'd', 'x', 'w', 'f', '7191', 'm', 'a', 'f', 'b', '4269', 'h', 'm', 'z', '3901', 'g', '5923', '7253', '8497', '4145', '453', '909', '6301', '9195', '6907', '4791', '1845', 'l', '9409', '1427']

A:
a, b, d, f, g, h, l, m, n, p, t, w, x, z
****