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]: ['f', '3409', 'i', '4147', '1745', '6007', 'l', 'd', 'i']
[A]: d, f, i, l


[Q]: ['2995', '8179', '8131', '5655', 'j', 'q', 'l', '3193', '1823', 'y', 'n', '7645', 's', '5665', 'r']
[A]: j, l, n, q, r, s, y


[Q]: ['173', '3307', '7561', '9941', '9457', '8595', 'q', 't', 'y', 'd', '7855', 'b', '8465', '9205', 'b', 'z', 's', 'q', '7391', 'n', 'r', '5885', 'a', '7093', '5615', '5475', '8819', '8463', '8711', '4635', '351', '3475', 'y', '8755', 'u']
[A]:
a, b, d, n, q, r, s, t, u, y, z