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]: ['2247', 'w', 'h', '4675', '6153', 'f', '6029', 'o', 'd', 'j', 'z', 'y', 'i', '6899', '3917', 'u', '6447', '6405', 'a', '1705', '8585', 'v', 'f', 'r']
[A]: a, d, f, h, i, j, o, r, u, v, w, y, z


[Q]: ['3611', '6825', 'j', 'e', 'r', 'a', '8889', 'y', 'x', 'k', '2651', '4545', '2289', 'r', 'q', '3163', 'a', 'i', 'j', 't', 'b', '2673', '4307', 'q', '5839', 'w', 'g', '6221', 'g', 'h', 'h', '5815', 'n', '3551', '7709', 'z', '2281', '7987', 'w', 'a', '2319', '3337', '3409']
[A]: a, b, e, g, h, i, j, k, n, q, r, t, w, x, y, z


[Q]: ['x', '9459', '1347', '8763', 'k', 'y', '1123', '803', '3553', '9727', 'b', '8463', '8653', '1351', '1579', 'i', '5191', '7693', '6201', '6425', 'g', '3729', '3607', '7993', 'a', 'r', 'o', 'w', 'm', 'l', '1865', '7617']
[A]:
a, b, g, i, k, l, m, o, r, w, x, y