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: ['315', '9975', '3013', 's', '6131', 'e', 'e', 'u', 'a', '1729', 'g', 't', 'y', 'f', '7523', 'e', 'g', '489', 'm', 'p', 'f', 'e', '2077', 'e', 'g', 'c', 'l', '6389', 'k', 'b']

A: a, b, c, e, f, g, k, l, m, p, s, t, u, y
****
Q: ['9483', '501', 'j', 'k', '3103']

A: j, k
****
Q: ['e', 's', 'r', '1333', '4381', 'h', '6401', 'y', '7971', 'x', '6637', 't', 'k', '2715', '3473', 'v', 'l', 'j', 'v', 'c', 'h', '7095', '3163', 'f', '9005', '4255', '6757', '8267', '1465', 'l', 'k', '1923', '9651', 'g', '2323', '5075']

A:
c, e, f, g, h, j, k, l, r, s, t, v, x, y
****