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: ['2123', '6181', 'x', 'c', 'h', '8197', 'j', 'a', 's', 'v', 't', '55', '4573', '1381', '1949', 'a', '3863', 'b', 'c', 'w', '7293', '2505', 'l', 'q', '7485', '3219', '5579', '4405', 'k', '913', '4297', 'e', 'e', '6801']
Solution:
a, b, c, e, h, j, k, l, q, s, t, v, w, x