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: ['m', '8127', '7519', '4543', '2809', '9855', 'n', '6241', 'w', 'w', 'q', 'w', 'p', '8599', '7819', '3817', 'm', 'q']

Output: m, n, p, q, w


Input: Consider Input: ['9403', '9881', '8391', 't', '1793', 'w', 'x', 'y', '6383', 'j', 'r', '5323', 'r', 'l', 'e', 'u', '7193', '2309', '837', 'z', 'w', 'n', '4427', '8269', '6333', 'a', 'p', '1933', '8497', '2665', '1349', '6807', '9009', 'b']

Output: a, b, e, j, l, n, p, r, t, u, w, x, y, z


Input: Consider Input: ['j', '5807', '5015', '1823', 'b', 'q', '7043', 'b', 'w', 'a', '1001', '3907', 'h', '8651', 'c', 'e', '6809', 'n', 'u', '817', 'g', 'i', 'c', '9483', 'c', '2143', '3145', 'r', '4937', 'x', 'f', '3733', '9795', '7959', 's', 'm', '2905', '1645', '3241', 'e', 'v', 'f', 'v', 'l', '1943']


Output: a, b, c, e, f, g, h, i, j, l, m, n, q, r, s, u, v, w, x