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:
['y', 'u', 'c', '5909', 'x', '9865', 'e', 'h', '5125', '4719', 'w', '8855', 'i', 'd']

Ex Output:
c, d, e, h, i, u, w, x, y


Ex Input:
['9579', 'm', 'v', 'r']

Ex Output:
m, r, v


Ex Input:
['8825', '6293', '9467', '8409', '9297', '2431', 't', '5821', 'c', 'd', 'o', '963', '9475', '6731', '6007', '3211', 'd', 'k', '1783', '1811', 't', 'f', '4671', '1459', 'w', 'd', 'r', 'w', 'j', 'u', '1467', 'f', 'i', '3171', '2335', 'q', 'd', 'p', '1383', '397', 'b', 'y', 'y', 'o', '633']

Ex Output:

b, c, d, f, i, j, k, o, p, q, r, t, u, w, y