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]: ['2915', '6033', '5541', '4685', '1263', '6701', 's', '7269', 'g', '8033', '8171', '6917', 'l', '2913', '447', 'g', 'a', 'z', 'o', '7563', '5385', '5259', '5067', '4869', '2653', '6925', '7001', '8553', 'x', '1243', '9131', '5037']
[A]: a, g, l, o, s, x, z


[Q]: ['545', '1617', '9591', '8545', 'h', '4571', '3905', '249', 'g', '3083', 'x', 'd', '9067', '385', 'x', 'v', '5401', '5231', 'c', 's', '1391', '2729', 'f', 'e']
[A]:
c, d, e, f, g, h, s, v, x