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]: ['3127', '9253', '5667', '9453']
[EX A]: -1

[EX Q]: ['5293', '2211', 'r', 'j', 'x', 'y', 'u', 'n', 'r', 'l', 'v', '113', 'v', 'e', '1323', '6291', 'a', '7417', 'j', '4175', 'd', '855', 'z', '1123']
[EX A]: a, d, e, j, l, n, r, u, v, x, y, z

[EX Q]: ['2297', 'k', 'v', '2711', 'z', 'd', '8997', 'o', 's', 'j', 'z', 'f', 'q', 'z', 'w', '4215', '5001', '7631', '8637', 'u', '6593', '3769', '2761', 'w', '61', '9435', 'e', '1335', '5693', 'd', 'd', '1609', 'q', 'a', 'q', 'h', '1727', '3047']
[EX A]:
a, d, e, f, h, j, k, o, q, s, u, v, w, z