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: ['f', '9203', 'w', 'f', '3751', '8095', '1319', 'f', '3017', 'r', 'y', '8221', '2715', '9959']

Output: f, r, w, y


Input: Consider Input: ['8051', 'h', 'g', 's', 't', 'p', 'w', 'x', 's', '8521', 'm', '9719', 'j', 'n', 'i']

Output: g, h, i, j, m, n, p, s, t, w, x


Input: Consider Input: ['2879', 'p', 'l', 'm', '5439', 'j', 'w', 'a', 'a', 'l', '2173', '5419', '8719', 'x', '237', 'a', 'e', 'u', 'p', '409', 'e', '4765', '5009', '6791', '7071', 'g', '9813', 'g', 'h', '1687', '759', '2541', '9477', 'w', '1665', '2959', '8621', 'c', '2905', '2667']


Output: a, c, e, g, h, j, l, m, p, u, w, x