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: ['7625', 't', '6709', '9325', '8421', 'e', 'l', '4059', 'x', '2203', 'y', '4329', 'y', '6807', '1501', '9985', '8063', '4841', '797', '1081', 'g', '4391', '8753', '1037', 'l', 'd', 'j', 'x', '1203', 'r', 'b', '9029', 'y', 'v', 'h', '7579', '2863', 'g', 'd', 's', 't', 'd']
Solution:
b, d, e, g, h, j, l, r, s, t, v, x, y