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: ['6627', '8037', 'q', 'e', 'j', 'p', '9613', '9317', 'm', 'm', '5345', 'f', '8105', '5665', '4175', '4793', '3707', 'i', 'b', '6745', '747', '8329', '1481', 'b', '8949', 'n', '4803', '1359', '3533', 'f', '543', '3003', '6943']

A: b, e, f, i, j, m, n, p, q
****
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']

A: a, c, e, f, l, r, t, y, z
****
Q: ['j', 'f', 'b', 'p', '5351', 'l', '5195', 'j', '4537', '5979', 'n', '3089', '5391', '7129', 't', '9029', '9215', '5413', 'a', '625', 'a', 'p', '7313', '1219', 'y', 'o', 'v', '2203', 'o', '5083', 'e', 'w', '263', 'j']

A:
a, b, e, f, j, l, n, o, p, t, v, w, y
****
