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]: ['5973', 'h', '4081', 'i', '8059', 'w', 'j', '6175', 'w', '8685', '5811', 'k', 'n', '5577', '9817', 'v', '8617', 'u', 'y', '3921', 'b', '1027', '5405', 'a', '3501', '6659', 's', 'e', '157']
[EX A]: a, b, e, h, i, j, k, n, s, u, v, w, y

[EX Q]: ['5181', '8651', '963', '2111', 'g', '7913', '8335', 'o', '1387', '9225', '6517', 's', 'r', '2291', '3699', 'y', 'y', '4223', 'i', '9109', 'm', 's', '8585', 'l']
[EX A]: g, i, l, m, o, r, s, y

[EX Q]: ['1653', 'i', 'k', '2057', '5779', '6251', '7689', 'h', 'b', '7575', 'm', 'g', '6209', '8451', '3657', 't', '243', '1111', '8121', 'i', 'n', '3693', 'm', '291', 'v', '3283']
[EX A]:
b, g, h, i, k, m, n, t, v