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.

['1223', 'h', 'a', 'o', 'v', '2535', 'g', '6267', 'w', '9625', '7961', '9577', '7611', '5655', 'p', 'j', 's', '2141', '4101', 'l', '4367', '9383', 'n', '5965', '9097', '7571', 'p', 'u', 'x']
a, g, h, j, l, n, o, p, s, u, v, w, x

['o', '5503', '5837', '4539', '7631', 'm', '2641', 'p', '7901', '8117', 'z', '3373', '3215', 'v', 'a', '5949', 'w', '9049', 'd', 'a', 'l', 'v', 'l', 'n', 'w', 'r', 'j', '9031', '9609', '4209', 'c', '7453', '5855', '2883', '5941', 't', '4283', 'x', 'x', 'n', 'c']
a, c, d, j, l, m, n, o, p, r, t, v, w, x, z

['f', 'b', '3395', 's', '9295', 'n', 'c', '7797', 'z', 'l', '5643', 'w', '8907', '2915', 'q', 'k', '4803', '5493', '1971', 'h', 'p', '9139', '9379', 'a', 'y', '2351', 'h', '3269', '8931', '1963', '9935', '9199', '7219', '271', '6479', '1177', 't', 't', 'a', '3679', '5715', '7475']

a, b, c, f, h, k, l, n, p, q, s, t, w, y, z