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.

Example Input: ['5293', '2211', 'r', 'j', 'x', 'y', 'u', 'n', 'r', 'l', 'v', '113', 'v', 'e', '1323', '6291', 'a', '7417', 'j', '4175', 'd', '855', 'z', '1123']
Example Output: a, d, e, j, l, n, r, u, v, x, y, z

Example Input: ['6143', 'y', '5505', '9813', 'r', 'v', 'u', '8681', '2387', 'u', 'o', 'm', '9793', 'm']
Example Output: m, o, r, u, v, y

Example Input: ['u', 'y', 'n', '9455', '8351', '7581', '3545', '7115', '8687', 'j', 'z', 'e', '5429', '5293', '3729', '5089', '6333', '6975', '1353', '4363', '1627', 'v', 'v', 'r', 'z', 'p', 'x', 't', '317', 'w', 'h', '721', '3089', 'n', 'a', 'd', 'u', 'z', 'p', '3397']
Example Output:
a, d, e, h, j, n, p, r, t, u, v, w, x, y, z