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]: ['8495', 'p', 'j', 'm', 'n', '9115', '1183', 'r', 'r', '8735', 'a', 'i', 'k', 'p', '8927', 'r', '9283', '9563', 'g', '2503', 'h', '1091', '5257', 'a', '3061', '2835', 'l', 'w', 'j', '7617', '8793', '7463', 'h', '8467', '7337', 'b', '4655', 'd']
[A]: a, b, d, g, h, i, j, k, l, m, n, p, r, w


[Q]: ['w', '1367', '5389', '9515']
[A]: w


[Q]: ['t', 'o', 'w', 'm', 'k', '9967', 'v', 'i', 'o', 'y', 'h', '4433', 'h', 'o', '15', 's', 'h', 'z', '1387', '8569', '6571', '2251', 'c', 'x', 's', '9461', 'h', '7767', '6173', '9299', '2231', '8433', '1011', '6603', 'v']
[A]:
c, h, i, k, m, o, s, t, v, w, x, y, z