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: ['8319', 'f', 'w', 'w', 'v', '6521', '4503', 'b', 's', 'b', '9651', 'k', '4635', '2195', '7537', '6839', 'i', 'd', 'b', '205', 'q', '7333', 'q', '5129', '4921', 's']
Example Output: b, d, f, i, k, q, s, v, w

Example Input: ['k', 'v', 'e', '6377', 'y', '3585', '4535', 'f', 'g', 'm', 'f', '8369', 'v', '7445', '4527', '9383', 'n']
Example Output: e, f, g, k, m, n, v, y

Example Input: ['u', '8997', '1883', '9861', 'y', '7061', '8865', '385', '4423', '6655', 'n', 'v', 'c', '397', 'k', '5107', '561', 'o', 'z', '3791', '5101', '823', '6465', '6869', 'n', 'v', 'r', '4271', 'f', 'i', '5011', '9803', '6533']
Example Output:
c, f, i, k, n, o, r, u, v, y, z