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]: ['p', '6123', '6961', 't', 'p', 'h', '9035', 'r', '6341', 'x', '3635', '5885', 't', '3543', '9567', '1787', 'o', '2991', 'k', '3441', '4091', 'a', 'r', '423', '9383', '7147', 'h', '663', 'd']
[A]: a, d, h, k, o, p, r, t, x


[Q]: ['9385', '4021', 'y', '9629', 'u', '7623', 'd', '5155', 'x', '2605', '8893', 'l', 'p', 'a', 'm', '6699', 'i', '4503', '6623', 'm', 'l', '6115', 'p', 'w', '9691', '811', '4769', '2659', 'x', 'c', '6513', '5499', 's', 'q', 'f', 'v', 'z', 'w', 'z', '1361']
[A]: a, c, d, f, i, l, m, p, q, s, u, v, w, x, y, z


[Q]: ['5045', 'f', 'w', '1381', '1835', '7635', 'j', 'z', 'y', 'j', 'd', '5553', '8631', '1093', '2479', '2989', '7809', 'l', '4119', 'm', '5471', 'o', '6729', 'p', '2479', '7409', 'd', 'j', '9487', 's', '1347', 'c', 'g', 'w', 'g', 'q', '7825', '1475', 'h', '1617']
[A]:
c, d, f, g, h, j, l, m, o, p, q, s, w, y, z