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.

['2181', '7019', 'l', 'z', 'z', 'y', '1245', '4179', '6951', '7249', '2723']
l, y, z

['n', 'h', 'j', '5945', '8511', 'y', '7739', '4717', '2483', 'p', '9545', '7647', '9863', '5591', '5393', 'i', '9225', '589', '1497', 'j', 'm', '2397', 'a', 'd']
a, d, h, i, j, m, n, p, y

['7245', 'c', '6993', 'n', 'y', '6029', 'e', 'f', '1769', 'j', '7395', 'b', 'h', 'e', '4309', 'u', '5603', 't', 'b', '4117', 'v', 't', '861', '5509', '307', 'r', '6669', 'v', '4951', 'q', '9829']

b, c, e, f, h, j, n, q, r, t, u, v, y