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:
['o', '5503', '5837', '4539', '7631', 'm', '2641', 'p', '7901', '8117', 'z', '3373', '3215', 'v', 'a', '5949', 'w', '9049', 'd', 'a', 'l', 'v', 'l', 'n', 'w', 'r', 'j', '9031', '9609', '4209', 'c', '7453', '5855', '2883', '5941', 't', '4283', 'x', 'x', 'n', 'c']

Ex Output:
a, c, d, j, l, m, n, o, p, r, t, v, w, x, z


Ex Input:
['n', 'y', '7087', '9539', 'x', 'i', 'w', '7237', '8613', 'k', '5999', '4179', 'o', 'm', '7485', '1955', 'w', '1451', 'h']

Ex Output:
h, i, k, m, n, o, w, x, y


Ex Input:
['e', 'n', '6719', 't', 'z', 'e', '7187', 'f', 'g', 'l', 'd', 'c', 'j']

Ex Output:

c, d, e, f, g, j, l, n, t, z