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: ['x', 'b', '1467', 'y', '2101', 'y', 'm', '2745', 'z', '429', '7523', 'e', 'f']
Example Output: b, e, f, m, x, y, z

Example Input: ['w', 'g', '1649', 'a', '2115', '6763', 'r', 't', 'l', 's', 'y', '5659', 'a', 'b']
Example Output: a, b, g, l, r, s, t, w, y

Example Input: ['4985', '1859', '6247', '9053', '5889', 'b', 'f', 'b', 'p', 'm', '4761', '3075', 'f', '7591', '445', '2669', '1421', '4875', '8783', 'h', '9273', '7017', 'i', '8655', 'b', '7053', 'w', '431', 'q', 't', '1533', 'c', 'b', '8651', 'v', '3239', 'o', '5907', '6831', 'a', 'v']
Example Output:
a, b, c, f, h, i, m, o, p, q, t, v, w