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.

[EX Q]: ['3627', '2051', '3203', 'c', 'r', 'a', '1453', 'e', 'z', 't', '1093', '4651', 'a', 'f', '8159', '9623', 'l', 't', 'r', '6963', '7071', '8103', '3493', 'y', '2369', '609', '2011', 'f', '187', 'f', 'c']
[EX A]: a, c, e, f, l, r, t, y, z

[EX Q]: ['z', '5601', '5675', 'w', 's', 'z', '9213', '9563', '1699', 'p', 'g', 'm', 'c', '9279', '4481', 'p', 'n', '2389', 'c', '503', '1901', '8827', '1701', '1607', '5633', 'a', 'z', 'g', '3175', 's', 'l', 'l', '6811', '1821', '693', '8277', 'q', '8623', 'o']
[EX A]: a, c, g, l, m, n, o, p, q, s, w, z

[EX Q]: ['9927', '2061', 'a', '175', '2561', '9093', 'f', '8675', 'x', '6979', 'g', '287', '9053', 'v', '4981', '7849', '7373', 'j', 'k', '5713', '8413', 'm', '7445', 'j', '415', '1717', '8999']
[EX A]:
a, f, g, j, k, m, v, x