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.

['1931', 'c', 's', '8767', 'z', '8977', '9249', '365', 'p', '7187', 'p', '961', 'k', 'k', '423', '5999', '4697', '6251', '6441', '1821', 's', 's', 'f', '5365', 'z', '5113', 'y', 'k', 'i', '5627', 'u', 'w', '4103', '8035', '7105', 'o', 'n', 's', 'y']
c, f, i, k, n, o, p, s, u, w, y, z

['1595', '2915', 'o', 't', 'c', 'h', '3969', '5407']
c, h, o, t

['a', '5351', 'b', 'f', '4031', '6735', 'd', 'w', 'd', '3305', 'n', '6137', '7887', 'a', '8251', 't', '3791', '711', 'q', 'o', 'd', 'l', 'd', '8517', '3901', '4131', 'w', 'x', '6655', 'y', 'h']

a, b, d, f, h, l, n, o, q, t, w, x, y