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: ['1223', 'h', 'a', 'o', 'v', '2535', 'g', '6267', 'w', '9625', '7961', '9577', '7611', '5655', 'p', 'j', 's', '2141', '4101', 'l', '4367', '9383', 'n', '5965', '9097', '7571', 'p', 'u', 'x']

Output: a, g, h, j, l, n, o, p, s, u, v, w, x


Input: Consider Input: ['9483', '501', 'j', 'k', '3103']

Output: j, k


Input: Consider Input: ['r', 'b', 'b', '177', '1353', 'l', '6785', '4901', '7383', 't', 'k', 'l', 'n', 'c', '7507', '6317', 'j', 'q', 'd', '1873', '2421', 'j']


Output: b, c, d, j, k, l, n, q, r, t