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:
['1367', 'h', '4153', '1587', 'h', 'b', 'n', 'u', 'n']

Ex Output:
b, h, n, u


Ex Input:
['u', 'i', '1185', '3795', '5417', 'k', 'b', '2629', '2635', 'z']

Ex Output:
b, i, k, u, z


Ex Input:
['u', 't', '209', '3499', '1337', '7279', '8589', 'w', '5691', '9185', 'e', 'a', 'a', '6225', '5525', 'g', '2943', '4631', 'k', '1491', 'l', 'e', 'k', 's', 'j', '3409', 's', 'z', '4277', '2279', 'p', '8567', '7393', '5833']

Ex Output:

a, e, g, j, k, l, p, s, t, u, w, z