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.

Q: ['u', 'w', '401', 't', 'g', 'h', 'g', '8073', '9597', '1347', '7835', '5007', '977', 'p', '7679', 'b', '4883', '4931', '999', 'r', '1181', 'x', '2063', 'l', 'w', 'i', 'l', 'x', 'i', '9057', '5007', 'w', '743', '1635', 'y', 'f', '9227', 'z', '5227', 'd', '7129', 'k', '7657']

A: b, d, f, g, h, i, k, l, p, r, t, u, w, x, y, z
****
Q: ['1447', 'q', '9529', '2971', 's', '7351', '6753', '3493', 'v', 'c', 'x', '3097', '9145', 'b', 'e', 'b', '2967', '6933', 'e', 's', 'v', 'f', 'z', 'r']

A: b, c, e, f, q, r, s, v, x, z
****
Q: ['k', 't', 'i', '2327', '6259', 'h', '823', 'l', '2255', 'i', '9089', 'a', '9079', 'w', 'm', 'f', '9917', '1453', '5907']

A:
a, f, h, i, k, l, m, t, w
****