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

[EX Q]: ['d', 'a', '6931', 'c', 'u', 'z', '9713', 'v', 'm', 'e', 'k', 'o', '9705', 'a', '5373', 'c', '2983', '8097', 'h', '3039', 'g', 'f', 'n', 'v', '853', '8227', '7573', 'j', 'h', 'k', 'o', 'k', '8897', 'd', 'g', 'd', 'd', '4039']
[EX A]: a, c, d, e, f, g, h, j, k, m, n, o, u, v, z

[EX Q]: ['p', 'd', 'c', '6399', '1035', 'u', 'e', '8735', 'q', 'l', '1301', '9263', 'd', 'y', '8023', 'n', 's', 'y', 'l', '6197', '6871', '4653', 'k', 'v', '3367', '2659', '3445', 'q', '7293', 'u', '4123']
[EX A]:
c, d, e, k, l, n, p, q, s, u, v, y