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: ['a', '3281', '9123', '5443', 'w', 'w', 'p', '9275', 'v', 'm', '3549', 'l', 'y', 'l']

Output: a, l, m, p, v, w, y


Input: Consider Input: ['q', '9033', 'p', 'z', '1743', '247', '967', '445', '9849', 'f', '9113', 'b', 'g', '6041', 'j', '927', 'i', 'p', '6821', 'q', '6701', 'f', 'j', 'o', 'y', 'c', '7981', 'b']

Output: b, c, f, g, i, j, o, p, q, y, z


Input: Consider Input: ['2851', 'b', 's', '8491', '5979', 'e', 'q', '1713', '6153', 'k', '5313', '6153', '9345', '9753', 'v', '6283', '6563', '8781', '4889', '5287', '5747']


Output: b, e, k, q, s, v