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: ['7155', 'y', '145', '7147', 'u', '8453', 'd', '3693', '6471', '5289', 'n', 'p', '8289', '2929', '199', 'e', '8377', '8937', '5315', 't', 'l', '7715', 'c', 'y', 'f', '9999', 'p', '3655', '5489', 'q', '2321', '9881', '2265', 'n', 'v', '455']

A: c, d, e, f, l, n, p, q, t, u, v, y
****
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: ['u', '4375', '6961', '8345', '3119', '8301', '25', '1721', '4563', 'o', 'y', '9427', 'c', '3021', '3113', 'q', 'p']

A:
c, o, p, q, u, y
****