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:
['p', 'v', '1099', 'y', '1313', 's', '181', 'u', 'e', 'u', '8435', '4125', '8661', 'c', '4605', 'f', 'x']

Ex Output:
c, e, f, p, s, u, v, x, y


Ex Input:
['2819', 'k', 'u', 'a', '4575', 'a', 't', 'a', 'f', '1507', '415', 'w', 'o', 'o']

Ex Output:
a, f, k, o, t, u, w


Ex Input:
['3129', 'z', '5271', 'e', '6055', '9539', '5225', 't', 'n', 'b', '551', '4453', '9867', 'i', 'f', 'l', 'j', 'e', '7937', '9031', 'q', '8701', 'j', '4827', '7065', '9079', 'c']

Ex Output:

b, c, e, f, i, j, l, n, q, t, z