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]: ['5181', '8651', '963', '2111', 'g', '7913', '8335', 'o', '1387', '9225', '6517', 's', 'r', '2291', '3699', 'y', 'y', '4223', 'i', '9109', 'm', 's', '8585', 'l']
[A]: g, i, l, m, o, r, s, y


[Q]: ['o', 'd', '6495', '5211', '341', 'v', '385', 'v', 'g', 'v', 'l', '7631', '2675', 't']
[A]: d, g, l, o, t, v


[Q]: ['w', 'y', '1655', 'm', '2371', '3713', 't', '7963', 'n', 'o', 'f', '4615', '535', 'o', 'j', '493', '9603', 'a', '5943', '915', 'r', 'm', 'p']
[A]:
a, f, j, m, n, o, p, r, t, w, y