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: ['7777', '6223', 'k', 'k', 'd', '9743', '189', '7705', 'c', '6115', '4275']
Example Output: c, d, k

Example Input: ['5161', 'v', 'y', '6005', 'y', 'l', '5451', 'z', 'j', 'd', '4597', '9319', '1241', 'g', 'f', 'b', 'g', '683', '763', 'm']
Example Output: b, d, f, g, j, l, m, v, y, z

Example Input: ['a', 'n', 'x', '429', 'x', 'k', '2061', 'c', '4415', '149', '6961', '8241', 'x', '8237', 'o', '7599', '9919', 'f', 'g', '1907', 'e', '3573', 'i', '7087', '5279', '7789', 'l']
Example Output:
a, c, e, f, g, i, k, l, n, o, x