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.

[EX Q]: ['z', '3219', '6399', '2357', '7597', '357', 'k', 'k', 'u', 'd', '6115', 'w', '2921', '8809']
[EX A]: d, k, u, w, z

[EX Q]: ['d', '5285', 'z', 't', 'i', '719', 'z', 'b', '3603', '4781', 'o', 'g', 'j', 'd', 'r', 'a', 'x', '5829', '4907', '7395', '993', '2109', '1745', '415', '7525', '1029', '7791', '5321', 'h', '6391', 'g', '4613', '9191', 'o', '7365', '1811', '9695', 'w']
[EX A]: a, b, d, g, h, i, j, o, r, t, w, x, z

[EX Q]: ['175', 'w', '255', 'h', '4279', 't', 's', '2165', 'f', '3607', 'l', '1801', '4345', '9951', '8839', 'j', '4433', 't', '3335', '5987', 'd', 'p', '3825', '3885', 'l', 'm', 'g', '6325', '5771', '2099', 'g', 'c', 'k', 'v', '7545', '4899', 'z', 't', '9591', '4205']
[EX A]:
c, d, f, g, h, j, k, l, m, p, s, t, v, w, z