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:
['i', 's', 'f', 'i', '2293', '245', '4983', 'h', 'h', '6203', '8703', '1613', 'h', 'o', '3635', '8069', '2829', '1939', 'u', 'm', '5305', 'n', 'k', '9367', 'u']

Ex Output:
f, h, i, k, m, n, o, s, u


Ex Input:
['y', 'u', 'c', '5909', 'x', '9865', 'e', 'h', '5125', '4719', 'w', '8855', 'i', 'd']

Ex Output:
c, d, e, h, i, u, w, x, y


Ex Input:
['h', '7845', 'g', 'h', 'f', '6391', '2431', 'i', 'n', 'u', 'n', 'n', '5537', 'f', '9791', '3549', '2969', 'u', '6027', '951', '2803', 'q', 'y', '5737', 't', '4241', '8135', '265', '9323', '4133', 'z', '185', '5719', 'k', 'y', 'j', 'n', '461', 'u', '173', 'v']

Ex Output:

f, g, h, i, j, k, n, q, t, u, v, y, z