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]: ['9467', 'o', '8347', '7125', '7999', '1737', 'h', '7043', '8617', '2033', '9959', '2349', 'p', '9389', '5525', 'w', 'u', 'p', '4703', '9807', 's', 'f', '2359', '7357', '2471', '5447', 'f', 'w', '2865', '6627', '3211', 'y', '23', 'z', 's', '1517', '3553', 'r', '2251']
[EX A]: f, h, o, p, r, s, u, w, y, z

[EX Q]: ['p', '6123', '6961', 't', 'p', 'h', '9035', 'r', '6341', 'x', '3635', '5885', 't', '3543', '9567', '1787', 'o', '2991', 'k', '3441', '4091', 'a', 'r', '423', '9383', '7147', 'h', '663', 'd']
[EX A]: a, d, h, k, o, p, r, t, x

[EX Q]: ['l', '8269', '9869', 's', '6087', '651', '7051', 'x', 't', '5981', '9513', 'c', '5917', '4585', '9807', 'e', 't', 's', '3575', '3287', 'p', 'n', 'f', 'h', 'v']
[EX A]:
c, e, f, h, l, n, p, s, t, v, x