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: ['331', '125', 'u', 'a', 's', '6995', 'i', '3613', '9727', '7087', 'l', 'b', '8291', '813', 'i', '1169', '2159', 'd', '1451', 'q']

Output: a, b, d, i, l, q, s, u


Input: Consider Input: ['1429', '7273']

Output: -1


Input: Consider Input: ['l', '5247', '7413', 'r', '33', 's', '9911', 'p', '4957', 'e', '3883', 'a', 'z', 'b', '6115', '4415', 'g', 'y', 'r', '8943', 'n', '6617', '5489', 'y', 'c', 'j', 'e']


Output: a, b, c, e, g, j, l, n, p, r, s, y, z