Definition: 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.
Input: ['l', '9045', 'm', 'j', '5415', '3965', 'd', 'z', '3069', '979', '5817', 'n', '7395', 'e', '4497', '4687', '9683', '5807', '2157', 'c', '6333', '1451', 'n', '9267', 'z', '8269', '7965', '9579', 'z', 'o', 'k', '4971', 'x', '4395', '5643', '9075', '2163', '3593']
Output:
c, d, e, j, k, l, m, n, o, x, z