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: ['c', '9125', '6049', '5201', 'v', '9311', 'q', '3305', 'l', 'q', '3387', '3647', 'x', '471', 'a', '5631', 't', '9679', '5423', '2569', 'w', 't', '6397', 'e', 'h', 'c', 'v', 'v']

A: a, c, e, h, l, q, t, v, w, x
****
Q: ['7799', '8163', '3389', 'x', 'k', 'm', '6085', 'f', '1131']

A: f, k, m, x
****
Q: ['1621', '7371', '5223', '8841', '2841', 'y', '5829', '3113', 'h']

A:
h, y
****