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:
['e', '2239', 'l', '8309', 'i', '2613', 'i', '611', '6481', 'j', 'v', '1867', '415', '269', '8053', '3369', 'q', 't', '2303', '7729', '1059', '6135', '3299', 'd', '6855', '207', '6227', '7859']

Ex Output:
d, e, i, j, l, q, t, v


Ex Input:
['y', 'p', 'q', '2157', 'b', 'w', '8875', 'k', 'i', 'd', '9743', '4941', 'b', 'p', '9941', '495', 'h', 'i', '839', 'c', 'h', 'f', 'b', 'a', 'k', 'z', '7549', '4149', 'h', 'j', '1947', 't', 'f', 'c', '1243']

Ex Output:
a, b, c, d, f, h, i, j, k, p, q, t, w, y, z


Ex Input:
['y', 'w', 'e', '2735', '8351', 'f', '8063', '783', 'v', 'd', 'c', 'y', '8491', '2331', 'l', 'b', 'g', 'a', '8059', 'p', '6365', 'l', 'c', '4497', '6611', '5881', 'y', 'f', 'x', 'k', 'e', 'e', 'd', 'h', '6545', '9473', 'w', '7439', 'h', 'q', '6879', '7187', '4111', 'b']

Ex Output:

a, b, c, d, e, f, g, h, k, l, p, q, v, w, x, y