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]: ['j', 'f', '9567', 'f', '7383', 'k', '599', '1091', '1501', 'y', 'o', 'c']
[A]: c, f, j, k, o, y


[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']
[A]: a, b, d, g, h, i, j, o, r, t, w, x, z


[Q]: ['2331', 'z', 'a', 'i', '4867', 'h', '5977', 'c', 'j', 'j', 'c', 'q', 'u', 'l', '4839', 'b', 'l', '3615', '2187', 'i', 'x', 'r', 't', '7071']
[A]:
a, b, c, h, i, j, l, q, r, t, u, x, z