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: ['w', '1081', 'n', '2073', 't', '6351', '5591', 'a', '113', 'w', 'q']

A: a, n, q, t, w
****
Q: ['c', 'a', 'p', 'p', '4203', '1587', '2953', '9809', '99', '5821', 't', 'i', '4213', '1809', 's', 'l', 'i', 'b', '9233', '3983', '7713', '1807', 'k', 'f', '7825', '5491', 'o', '1347', 'u', 'h', '3967', 'u', 'g', '6775', '1069', '9211', 'i', '3369', 'r']

A: a, b, c, f, g, h, i, k, l, o, p, r, s, t, u
****
Q: ['k', '8187', 'r', 'e', 'e', '427', '2751', 'd', 'm', '1613', '9757', '5075', '1603', 'f', 'd', 'x', 'v', '7837', 'o', 'f', '2923', '415', 'i', 'p']

A:
d, e, f, i, k, m, o, p, r, v, x
****