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: ['231', 'r', '5673', 'j', '589', 'z', '4659', 'a', '3763']

A: a, j, r, z
****
Q: ['t', 'h', '6141', 'g', 'f', 'z', 'n', 'b', 'k', '9059', 'y', 'p', '4289', '2683', 'a', '3267', 'w', 'p', 't', '3623', '7759', 'a', 'o', 'm', '9815', 'q', 'u', '8051', '6871']

A: a, b, f, g, h, k, m, n, o, p, q, t, u, w, y, z
****
Q: ['8975', '9533', '2337', '9657', 'r', '3443', 'u', 'g', 'u', '9673', 't', 'z', '945', 'm', 'l', '4061', 'h', '7241', '1135', '2489', 'd']

A:
d, g, h, l, m, r, t, u, z
****