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', 'i', 'h', 'g', '5123', 'i', 'r', '3183', 'w', 'g', 's', '9777', '455', 'l', 'r', 'h', 'e', 's', 'v', '6823', '463', '9603', 'e', '947', '7071', 'c', '3373', 'j', 'w', 'm', 's', 's', '3483', '9567']

Ex Output:
c, e, g, h, i, j, l, m, r, s, v, w


Ex Input:
['4213', '3595', '7937', 'y', '5723', 'v', 'b', '7007']

Ex Output:
b, v, y


Ex Input:
['h', 't', 'f', '3249', 'f', '7269', 'e', 'h', '4127', 'o', '6977', 'w', 'o', 'e', '4649', '1087', 'y', '2131', '8573', '1261', '467', '9059', '4437', '5801', '1785', '6803', 'n', 'r', '165', 'b', 'z', '2155', 'f']

Ex Output:

b, e, f, h, n, o, r, t, w, y, z