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]: ['7187', '7081', 'j', 'i', '3725', '6333', 'h', 'f', '6639', 'r', 'n', '3559', '2785']
[A]: f, h, i, j, n, r


[Q]: ['p', 'g', 'q', 'e', '8045', '9999', '9555', '7995', '7195', 'z', 't', '5223', '3699', 'i', '4797', '3817', 'x', 'y', 'w', 'o', '8915', '7803', 'n', '1117', 'c', '9647', 'p', 'e', '9669', '4845', '9255', '4545', '3693', '6871', 'w', '4327', '3285', 'k', 'f', 'x', 'i', 'b', '5967', '6601']
[A]: b, c, e, f, g, i, k, n, o, p, q, t, w, x, y, z


[Q]: ['r', '9281', '7495', '4777', 'u', 'l', '5663', 's', '7157', '7675', '2177', '147', 'h', '5207', '7359', '4499', 'h', '6601', 'v', 'm', 'v', '7503', '4401', '2733', '985', '4965', 'c', 'a', '5241', '9191', 'w', '4885', '3371', '5199', 'b', 'v', 'r', '8611']
[A]:
a, b, c, h, l, m, r, s, u, v, w