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]: ['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']
[EX A]: a, g, l, o, s, x, z

[EX Q]: ['j', 's', 'z', 'v', '5401', 'u', '8859', 'i', 'l', 'a', 'p', 'v', 'v', 'o', '3969', '4091', 'y', '6827', '1799', '5163', 'd', 'w', '4795', '5167', 'x', 'q', '2903', '1171', '5279', '449', '7901', 'u']
[EX A]: a, d, i, j, l, o, p, q, s, u, v, w, x, y, z

[EX Q]: ['2767', 'f', 'd', '3451', 'h', '2813', '4371', '3473', 'v', '873', '5891', '7499', 'x', 'd', 'y', 'r', 't', '2021', 'i', 't', 'g', 's', '7059']
[EX A]:
d, f, g, h, i, r, s, t, v, x, y