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.

['c', '9125', '6049', '5201', 'v', '9311', 'q', '3305', 'l', 'q', '3387', '3647', 'x', '471', 'a', '5631', 't', '9679', '5423', '2569', 'w', 't', '6397', 'e', 'h', 'c', 'v', 'v']
a, c, e, h, l, q, t, v, w, x

['m', '7807', 'n', 'w', '5097', '1023', '2723', 'u', '3055', '7285', 'f', 'm', 'w', '5197', '9743', '7519', '4451', 'c', 't', '1939', '5847']
c, f, m, n, t, u, w

['v', 'v', '9525', 'b', 'n', '3839', '7423', 'h', '6825', '1279', 'u', 'x', 'e', '8819', 'l', '5043', '3987', '5807', 'o', 's', 'k', '1373', '2951', 'h', 'f', 'w', 'u', '9879', 'z', '9135', 'u', 'w', 'f', '797', '9775', 'l', 'v', '5341']

b, e, f, h, k, l, n, o, s, u, v, w, x, z