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: ['d', '8489', 'j', '7629', '2851', 'd', '1781', '5287', '8393', '2957', 'e']

d, e, j