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.

Ex Input:
['w', 'o', 'l', '5331', 'k', '9325', '6759', '7931', '8185', 'w', 'h', 'h', 'x', '4357', '6845', 'v', 'o', '8401', 'u', 'g', 'f', 'j', 'j', '2493', '4753', 'c', 'm', '1469', '4307', 'm', '2737', 'n', 'y']

Ex Output:
c, f, g, h, j, k, l, m, n, o, u, v, w, x, y


Ex Input:
['8821', '9833', 'l']

Ex Output:
l


Ex Input:
['2883', '3805', 'x', 'x', 'k', 'i', '6643', '7055', 'x', '5517', '4685', 'n', '1485', '7989', '1701', '1559', 's', '2121', 'g', 'h', '6653', 'o', '661', '7295']

Ex Output:

g, h, i, k, n, o, s, x