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]: ['1449', 'a', '6261', '303', '4651', 'n', 'u', '1595']
[EX A]: a, n, u

[EX Q]: ['k', 'j', 'v', '5277', '8607', 'n', '1109', 'e', 'k', '6579', 'o', '2909', 'u', 't', '9685', '8443', '9257', '8071', 'y', 'b', 'h', '4767', 'a', 'j', '8455', 'b', '7733', '2553', 'e']
[EX A]: a, b, e, h, j, k, n, o, t, u, v, y

[EX Q]: ['d', '327', '8319', 'a', 'e', 'm', '4183', 'p', '4715', 'h', '6453', '9723', '9693', '4665', '9447', 'a', 'v', '6963', 'w', 'p', 'z', 'b', 'q', '4639', 'r', 'k', '8073', '9173', '6467', '5731', 't', 'o', 'o', '347']
[EX A]:
a, b, d, e, h, k, m, o, p, q, r, t, v, w, z