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: ['9385', '4021', 'y', '9629', 'u', '7623', 'd', '5155', 'x', '2605', '8893', 'l', 'p', 'a', 'm', '6699', 'i', '4503', '6623', 'm', 'l', '6115', 'p', 'w', '9691', '811', '4769', '2659', 'x', 'c', '6513', '5499', 's', 'q', 'f', 'v', 'z', 'w', 'z', '1361']

Output: a, c, d, f, i, l, m, p, q, s, u, v, w, x, y, z


Input: Consider Input: ['j', '1733', 'p', '6741', '7933', '8943', '733', 'x', '1107', 'z', '1719', '7653', 'y', 'z', '6563', 'p', '4615', 'j', '4489', 'h', 'w', 'y', 'p', 'c', '7949', 'k', 'm', 'r', '9427', '7243', '9777', 'j', '323', '4095', 't']

Output: c, h, j, k, m, p, r, t, w, x, y, z


Input: Consider Input: ['2259', 'w', 'r', '1621', '8849', 'z', 'p', 'h', 'v', 'g', 'e', 'g', 's', '8463', '4137', '3165', 'e', 'p', 'e', 'q', 'v', 'a', '3887', 'g', 'g', '5021', '8111', 'c', 'x', 'a', '4523', '441', '2451', 'l', '2997', 'g', 's', '1113']


Output: a, c, e, g, h, l, p, q, r, s, v, w, x, z