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:
['1653', '3177', 'b', '2785', '2515', 'd', '5513', '5599', '2947', 'v', '2771', '5697', '2913', '4161', '5939', '2655', '6787', '9851', 'q', '3199', 'x', '1305', '9423', '9117', '4821', 'j', '7963', 'i', 's', '469', 'r', 'w']

Ex Output:
b, d, i, j, q, r, s, v, w, x


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:
['1493', 'w', '5351', '629', '9657', 'l', '1839', 'q', '6197', 'z', '4635', '9785', '7153', '2105', '7077', 'b', '7591', 'l', '6271', '8475', '5073', '109', '3101', 'q']

Ex Output:

b, l, q, w, z