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]: ['9483', '501', 'j', 'k', '3103']
[A]: j, k


[Q]: ['4711', '8549', '3119', 'i', 'g', 'e', 'v', 'o', '8407', '165', '8167', 'o', '907', 'w', 'r', 'i', '9165', 'd', 'm', '5041', 'z', '2725', 's', '5389']
[A]:
d, e, g, i, m, o, r, s, v, w, z