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: ['3627', '2051', '3203', 'c', 'r', 'a', '1453', 'e', 'z', 't', '1093', '4651', 'a', 'f', '8159', '9623', 'l', 't', 'r', '6963', '7071', '8103', '3493', 'y', '2369', '609', '2011', 'f', '187', 'f', 'c']
Example Output: a, c, e, f, l, r, t, y, z

Example Input: ['c', '7039', 'g', '1899', 'r', '507', 'c', '2587', '3865', '1729', '3927', 'r', '3535', '2791', 'm', 'l', 'r']
Example Output: c, g, l, m, r

Example Input: ['f', 'a', 'v', 't', '6047', 'c', '3363', '5093', '6337', '4745', 'b', 'r', '8441', 'x', 's', 'v', 'g', '5707', 'o', '6965', 'f', 'c', '3539', 'y', '4457', '2075', '4609', 'g', 'd', '2893', 'v', '4831', 'v', '5515', '1995', 'i', '5071', 's']
Example Output:
a, b, c, d, f, g, i, o, r, s, t, v, x, y