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: ['9403', '9881', '8391', 't', '1793', 'w', 'x', 'y', '6383', 'j', 'r', '5323', 'r', 'l', 'e', 'u', '7193', '2309', '837', 'z', 'w', 'n', '4427', '8269', '6333', 'a', 'p', '1933', '8497', '2665', '1349', '6807', '9009', 'b']

A: a, b, e, j, l, n, p, r, t, u, w, x, y, z
****
Q: ['575', 'u', 'c', '8113', '2853', '3661', '9427', '3071', '4069', '835', 'w', 't', 'w', 't', 'v', 'g', 'c', '5497', '1703', '8433', 'g', '3545', '2887', 'z', 'a', '2241', '5799', '5915', 'u', '4015', '8327', 'z', 'a', 'w', '8311', '289', '8575', 't', 'b', '2873', 'r', 'z', 'x', '1165', '9881']

A: a, b, c, g, r, t, u, v, w, x, z
****
Q: ['u', '9289', 'j', '4323', 'c', 'b', '327', 'a', '4557', '8625', '2491', 'g', 'n', 's', '1067', '9823', 'z', 'q', 'd', 's', '5631', '9515', 't', '8647', 'v', '5349', '3937']

A:
a, b, c, d, g, j, n, q, s, t, u, v, z
****