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: ['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: ['315', '9975', '3013', 's', '6131', 'e', 'e', 'u', 'a', '1729', 'g', 't', 'y', 'f', '7523', 'e', 'g', '489', 'm', 'p', 'f', 'e', '2077', 'e', 'g', 'c', 'l', '6389', 'k', 'b']

A: a, b, c, e, f, g, k, l, m, p, s, t, u, y
****
Q: ['2563', 'c', 'j', 'l', 'm', 'z', '6649', '1621', 'a', '9207', '5671', 'a', 't', 'r', 'h', 'e', 'u', 'd', 'a', 'i', '5539', 'b', 'y', 'a', '1665']

A:
a, b, c, d, e, h, i, j, l, m, r, t, u, y, z
****