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.

Input: Consider Input: ['c', '1693', 'l', 'u', 'x', '3609', 'h', '4159']

Output: c, h, l, u, x


Input: Consider Input: ['r', 'n', '7583', '8697', '7927', 'l', '5003', '1363', 'p', 'e', 'q', '6227', '6915', '8619', '9011', 'n', '3063', '3799']

Output: e, l, n, p, q, r


Input: Consider Input: ['e', 'y', 'b', '9749', 'j']


Output: b, e, j, y