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.

['u', '1343', 'd', 'c', '9567', 'e', 'd', 'y', 's', '4199', '3217', '2937', '9345', 'd', 'l', '9875', '5987', 'p', '2585', '5843', '9643', '2423', 'e', 'l', 's', '3503', 'b', 'w', '9685', 'p', '6055', 'k', 'e', 'e', 't', '865', '6071', 'j', '3439', 't']
b, c, d, e, j, k, l, p, s, t, u, w, y

['5737', 'b', 'e', 't', '7419', 'n', 'y', '5225', '6485', 'b', '1343']
b, e, n, t, y

['f', 'm', '2087', '4721', 'z', 'c', '929', 'n', '6097', '8839', 'z', 'w', '1373', 'g', 's', '1637', '2419', 'm', '3769', '6563', '9693', 'b', '6031', '471', 'h', 'z', '4225', '7283', 'f', 'v']

b, c, f, g, h, m, n, s, v, w, z