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]: ['2381', '2865', '4821', 'n', 'u', 's', 'p', 'v', 'v', 'n', '1349', '7903', 'm', '193', 't', 'p', 'c', '3521', 'a', 't', '8281', 'i', '151', '4783', 'm', '3387', '9551', 'z', 'q', 'v', '4549', '4411', 'u', '8735', '2645', '359', '2871', '5923', '5071', 'c', '9843', 'i']
[A]: a, c, i, m, n, p, q, s, t, u, v, z


[Q]: ['w', '5341', 'b', '6243', 'v', '877', '1087', '6763', '5241', '3369', '9119', 't', 'v', 'j', '8261', 'o', 'b']
[A]: b, j, o, t, v, w


[Q]: ['907', 'l', '4393', 'a', '5829', 'l', 'n', '6461', 'g', 'w', 'n', '3261', 'u', '1127', 'o', '5141', 'i', 'z', 'd', 'g', 'h', 'i', 'y', 't', 'y', '4165', '3021', 'y', '753', 'q', '9797', '8479', 'w', '4495', '8663', '6691', 'g', '1527', '9459', '3079', '1623', 'h', 'a']
[A]:
a, d, g, h, i, l, n, o, q, t, u, w, y, z