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: ['e', 'z', '5199', 'x']

Output: e, x, z


Input: Consider Input: ['l', 'l', '7663', 'k', 'g', '1397', '7803', 'z', 'e']


Output: e, g, k, l, z