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: ['6679', '9703', '3831', 'v', '1981', 'z', 'q', 'o', '8963', '3235', '1407', 'j', '9409', 'w', 'c', '8393', 's', '3647', 't', '3603', 'g', '1135', '7775', 'u', 'n', '4113', 'e', 'w', 'z', 'e', '4131', '8985', 'g', '8585', '1289']
Solution:
c, e, g, j, n, o, q, s, t, u, v, w, z