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.

['r', 'y', 'c', '3211', '9245', '8459', '8521', '5781', 'w', 's', 'd', '5299', 'a', 'y', 'g', 'm', '6435', '8605', 'e', 'h', '6871', 's', '387', 'l', '5829', 'e', 'd', '9545', '2945', 'k', 'v', 't', '8449', '2199', 'm', '2599', '1489', '6623', 'x', 'l']
a, c, d, e, g, h, k, l, m, r, s, t, v, w, x, y

['u', 'k', 'd', '4393', 'u', 'h', 'q', '833', 'k', 'l', '5749', 'r', '7123', '1003', 'z', '531', 'o', 'u', '6601', '6975', '4905', 'n', 'e']
d, e, h, k, l, n, o, q, r, u, z

['k', 'v', 's', 'j', '5011', 'o', '263', '6305', '2899', '5487', 't', 'z', '9027', '381', '1137', '3595', '8139', 'v', 'e', '5399', '4567', 'n', 'c', 's', '8901', '6841', 'v', '5011', '4531', '4707', 't', '6725', '2169', '9677', '297']

c, e, j, k, n, o, s, t, v, z