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.

Example Input: ['2741', '2541', '8943', 'l', '4047', '2211', 'p', 'e', 't', '7645', '9771', 'f', '5063', '2303', '6097', '5089', 'd', 'e', '1409', '3125', '2171', 'g', '1247', '4045', 'v', 'h', 'u', '2587', '5207', '5553', 'g', 'd', '6891', 'e', '2471', '2435']
Example Output: d, e, f, g, h, l, p, t, u, v

Example Input: ['d', '1625']
Example Output: d

Example Input: ['4537', 'b', '2175', '1775', 'r', 'm', 'i', 'b', 'i', 'l', 'm', 'a', '5111']
Example Output:
a, b, i, l, m, r