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]: ['277', '8697', 'q', '2023', '5723', 'm', '8673', 'f', 'z', 'z', 'a', '9875', 'p', 'x', 'l', 'z', 'x', '619', '6509', 's', '2067', '571', 't']
[A]: a, f, l, m, p, q, s, t, x, z


[Q]: ['1653', '3177', 'b', '2785', '2515', 'd', '5513', '5599', '2947', 'v', '2771', '5697', '2913', '4161', '5939', '2655', '6787', '9851', 'q', '3199', 'x', '1305', '9423', '9117', '4821', 'j', '7963', 'i', 's', '469', 'r', 'w']
[A]: b, d, i, j, q, r, s, v, w, x


[Q]: ['821', 'o', '1325', '5643', '4245', '9301', '8171', '4697', 'k', '1497', 'n', 'w', 'q', '883', '1569', '5499', '1499', 'd', 'f', '3161', '1029', '4141', '7201', '4473', '9659', '1347', '3865', '3067', 'd', 'c', 'z', 'l', '7807', 'm', 'p', '1015']
[A]:
c, d, f, k, l, m, n, o, p, q, w, z