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.

['9223', 'w', '8631', '4453', '9975', 'y', '9747', 'g', '7077', '2593', '6015', 'n', '7345', 'i', '7807', '299', 'q', '3629', '2545', 'k', 'm', 'q', '5155', '5633', 'x', 'q', 'i', '27', 'f', '7919', 'p', '4835']
f, g, i, k, m, n, p, q, w, x, y

['1063', 'f', 'm', 'i', 'x', 'i', 'd']
d, f, i, m, x

['6679', 'k', 'j', '4111', 'f', '4589', 'o', '9629', '4965', 'x', 'g', '4185', '1339', 'q', 'c', '2185', 'i', 'n', 'l', 'f', 'q', '2387', 's', 'e', 'v', 't', '5499', 'x', '3535', '6601', 'n', '7485', '9155', 'u', '9637', 'e', 'a', '703']

a, c, e, f, g, i, j, k, l, n, o, q, s, t, u, v, x