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: ['7489', '9853', 'j', '4827', 'm', 'c', '1433', 'i', 't', '4057', 'k', '3429', 'w', '8027', '465', '1335', '4689', 'g', '6879', '8249', 'w', 'g', '3115', '1111', '4171', 't', 'p', 'g', 'f']
Output:
c, f, g, i, j, k, m, p, t, w