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: ['u', 'i', '1185', '3795', '5417', 'k', 'b', '2629', '2635', 'z']

A: b, i, k, u, z
****
Q: ['6627', '8037', 'q', 'e', 'j', 'p', '9613', '9317', 'm', 'm', '5345', 'f', '8105', '5665', '4175', '4793', '3707', 'i', 'b', '6745', '747', '8329', '1481', 'b', '8949', 'n', '4803', '1359', '3533', 'f', '543', '3003', '6943']

A: b, e, f, i, j, m, n, p, q
****
Q: ['p', 'c', 'p', '5725']

A:
c, p
****