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: ['j', 'r', 'z', 'f', '1485', '2419', 't', 'd', '6023']

A: d, f, j, r, t, z
****
Q: ['w', '9437', 's', '9819', 'q', 'q', '4443', 'p', '377', '6777', 's', 'x', 'a', 'o', '9205', '9289', '7103', 'k', 'l', '9453', '9043', 'k', 'r', 'g']

A: a, g, k, l, o, p, q, r, s, w, x
****
Q: ['q', 'r', 'e', '6919', 'd', '847', '8105', 'l', 't', 'i', 'r', 'm', 'x', '7123', '6659', '2919', '619']

A:
d, e, i, l, m, q, r, t, x
****