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.
One example: ['8129', 'a', '4245', 'y', 'm', 'a']
Solution is here: a, m, y
Explanation: Here, the unique alphabets in the list are 'a', 'y', and 'm', hence their sorted order is 'a, m, y'.

Now, solve this: ['q', '1197', '191', 'j', '7907', 'k', 'z', '8271', 'j', 'z', '3547', '3441', '4715', 'k', 's', 's', 't', '2663', 'r', 'n', 't', 't', '4859', '1643', '8765', '2941', '1745', 'v', 'h', '6777', 'v', 't', '6955', '4555', '819', '9257', '1609', 'z', 'f', 'n', '9607', '3539', '9701', '6883', 'm']
Solution:
f, h, j, k, m, n, q, r, s, t, v, z