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.

['n', 'h', 'h', 'e', 'p', '1265', '4853', '9433', '1227', '1619', '6381', 'o', '8285', 'k', 'u', '7471', 'm', '6887', '6579', '5813', '5563', '8535', 'n', '3743', 'h', 't', '4497', '2791', 'e', 'v', '6769', '7969', 'x', 't', 'x', 'q']
e, h, k, m, n, o, p, q, t, u, v, x

['9425', 'l', 'c', 'n', '5925', '2543', '3935', 'c', '7533', 'j', 'q', '3775', '5897', '9435', '69', 'e']
c, e, j, l, n, q

['g', '5917', '8347', '7991', 'v', 'f', '6521', '4111', '1147', 'r', '2307', '7239', 'w', '1207', '8947', '9247', '9325', '7115', '7999', 'a', '8951', 'o', '2143', 'r', '6991', '8969', 's', 'p', 'r', '8643', 'm', 'p']

a, f, g, m, o, p, r, s, v, w