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]: ['e', '1251', 'y', '6689', '6389', 'h', 't', '503', '5093', 'e', '923', '7051', 'm', 'u', '4501', '3289', '6887', '8341', 'o', '3671', 'n', 'w', '7749', 's', 'j', 'o', '8429', 'q', 'v', 'p', 'd', 'g', 'i', 'f']
[EX A]: d, e, f, g, h, i, j, m, n, o, p, q, s, t, u, v, w, y

[EX Q]: ['d', 'p', 'q', '5319', 'w', '4887', '6695', 't', '7711', 'l', '7597', 's', 'n', '1461', 'e', '9045', '1307', 'j']
[EX A]: d, e, j, l, n, p, q, s, t, w

[EX Q]: ['x', '6013', '4305', 'h', '6815', '2349', 'e', '4755', 'c', 'm', '9333', '6019', 'c', 'o', 'y', 'w', 'b', 'g', '4571', 'u', '3601', 'w', '5339', 'e', 'b', '1749', '4105', 'u', 'z', 'e', '1139', 'f', '5987', 'p', '4769', '7259', 'x', 'j', 'f']
[EX A]:
b, c, e, f, g, h, j, m, o, p, u, w, x, y, z