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: ['8495', 'p', 'j', 'm', 'n', '9115', '1183', 'r', 'r', '8735', 'a', 'i', 'k', 'p', '8927', 'r', '9283', '9563', 'g', '2503', 'h', '1091', '5257', 'a', '3061', '2835', 'l', 'w', 'j', '7617', '8793', '7463', 'h', '8467', '7337', 'b', '4655', 'd']
Example Output: a, b, d, g, h, i, j, k, l, m, n, p, r, w

Example Input: ['1063', 'f', 'm', 'i', 'x', 'i', 'd']
Example Output: d, f, i, m, x

Example Input: ['c', 'g', 'b', 'm', '9655']
Example Output:
b, c, g, m