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: ['w', '6063', 'i', '261', 'v', '7341', '8003', '3571', 'p', '6183', '7329', 'i', '1567', 'w', '3151', 'j', '2671', '8567', 'q', '8785', 'c', '5837', '7933', 'r', '8225', '2207', '2841', 'p', 'g', '6957', '437', '4035', '8205', 'o']
Solution:
c, g, i, j, o, p, q, r, v, w