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: ['1233', '405', '8901', '7147', '8841', 's', 'v', '3131', 'p', 'd', 'y', '5873', '439']

Output: d, p, s, v, y


Input: Consider Input: ['f', '7573', '2067', 'n', '3671', '7969', '7889', '4893', '6501', 'l', 'y', '4331', 'a', 'e', '2081', '3863', 't', 'j', '7921', 's', '7203', '7797', 'f', '4279', '1299', '987', '5003', '9071', '9559', '6061', '1889', '2653', 'm', 'w', '665', '7343', '9763', 'r', '6343', '9393', '9289']

Output: a, e, f, j, l, m, n, r, s, t, w, y


Input: Consider Input: ['v', '183', '6553', 'p', 'x', '125', '8969', '2403', '4625', 'm', 't', '3117', '2629', '5445', 'v', '1295', '3221', 'x', '2723', '9861']


Output: m, p, t, v, x