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: ['r', '9489', 'e', 'n', '6323', 'd', '3163', '265', '8587', '7891']

Output: d, e, n, r


Input: Consider Input: ['907', '2407', '1385', '3593', 'x', '4143', '2271', '8361', 'q', '5093', 'd', '257', 'm', 'a', '5751', '7845', '3925', '3517', '7753', 'e', '5803', '2629', 't', 'e', '845', '6157', '9787', '225', 'j', 'j', 'l', '1321', 'k', '2459', 'u', '9113', '3193', 'a', 'j', 't']

Output: a, d, e, j, k, l, m, q, t, u, x


Input: Consider Input: ['6113', 'f', 'i', 'z', '4997', 'q', 'f', '3169', '5357', 'o', 'j', 'x', '1303', 'y', '795', 'v', '6933', '505', '6133', 'o', 'f', 's']


Output: f, i, j, o, q, s, v, x, y, z