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.

Example Input: ['y', '8115', 'f', '5333', 'f', '3437', 'b', 'e', '5719', 'm', 'w', '95', '4863', 'k', '4895', 'a', '8179', 'm', '7919', '1731', '229', 'r', '1847', '7559', '6669']
Example Output: a, b, e, f, k, m, r, w, y

Example Input: ['b', 'd', '8153', 'u', '3695', '5317']
Example Output: b, d, u

Example Input: ['3613', 'x', 'r', '671', 'z', '9847', '4839', 'd', '5565', '3845', '9713', 'f', 'o', 'a', 'd', '8233', 'x', 'n', 'v', 'i', 's', 'c', '5543', 'v', '473', 'w', 'n', 'u', 'e', 'd', 'o', '8651', 'e', '3277', '7647', 'd', 'e', '6747', '5069']
Example Output:
a, c, d, e, f, i, n, o, r, s, u, v, w, x, z