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]: ['1657', 'u', '1849', '425', 'v', '6435', 'j', '2985', '921', '9553', '2621', 'i', '7103', 'd', '8563', 'l', 'b', '6727', '4235', 'n', '8021', 'd', 'z', '437', 'm', '5695', 't', '3421', 'e', 'a', '2941', '791', '1417', '9247', 'h']
[EX A]: a, b, d, e, h, i, j, l, m, n, t, u, v, z

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

[EX Q]: ['9583', '6103', 'e', '6497', '3871', '7805', '8591', '6281', '6555', 'e', '2091', 'u', '8391', '3949', 'd', 'w', '1645', '2093', 'n', 'd', '4243', '7983', '6531', 't', 'd', '7209', '6797', '8713', 'i', '691', '897', '8267', 'k', 'q', '9403', '3455', '2671', 'j']
[EX A]:
d, e, i, j, k, n, q, t, u, w