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: ['8489', 'h']

A: h
****
Q: ['o', '4169', 'k', '7349', 'w', 't', '8271', '8781', '3725', '2865', '6053', 'j', 'z', '4211', '8231', '213', '6389', 'f', 'h', 'g', '9269', '4617', '4137', 'i', 'y', 'i', 'n', '4597', 'p', 'z', '3195', '3231', 'c', '1901', '1231', 'p', '4509', '2557', '3715']

A: c, f, g, h, i, j, k, n, o, p, t, w, y, z
****
Q: ['8475', 'g', '7687', '4343', 'r', 'c', 'r', 'l', '8733', 'h', '6397', 'o', 'f', '8363', '6731', 'i', '1229', '1587']

A:
c, f, g, h, i, l, o, r
****