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', 'h', 'z', 'n', 'e', 'y', 't', '4371', 'm', '1059', '4853', '8529', 'l']

Ex Output:
e, h, l, m, n, o, t, y, z


Ex Input:
['2047', '4403', 'g', '3017', '1627', 'v', 'r', '2237', '5513', 'o', 'v', '7229', '9801', 'j', '443', 'z', 'q', 'y', '7447', '1659', '3411', '55', '5153', '9921', '2195', '1075', '8187', 'p', 'x', 'h', 'y', 't', 'a', 'r', 'f']

Ex Output:
a, f, g, h, j, o, p, q, r, t, v, x, y, z


Ex Input:
['4417', 'c', '4599', '6513', 'w', 'm', 'd', '7657', '3565', 'f', '5489', '727', '3941', 'm', 'n', 'g', '6085', 'h', '7767', '2665', 'p', 'b', 'j', 'c', 'j', '5941', 'w', 'y', 'f', '8165']

Ex Output:

b, c, d, f, g, h, j, m, n, p, w, y