Instructions: 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: ['3913', '5339', 'w', 'm', 'z', '5933', 'r', 'c', '6581', 'r', 'v', '3569', '6271', '8743', '8201', '4965', '8805', '6887', 'c', '9657', 'd', 'e', '9119', 'w', 'v', '6537', 'v', 'w', '999', '4205', '9643', '7331', 'n', '8945', 'h', '9617', '7637', 'f', '4281', '1237', '9143', 'k', 'j']
Output:
c, d, e, f, h, j, k, m, n, r, v, w, z