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: ['i', '9215', 'n', 'p', '4815', '8757', 'm', '1755', 'c', 'z']
Example Output: c, i, m, n, p, z

Example Input: ['e', '2239', 'l', '8309', 'i', '2613', 'i', '611', '6481', 'j', 'v', '1867', '415', '269', '8053', '3369', 'q', 't', '2303', '7729', '1059', '6135', '3299', 'd', '6855', '207', '6227', '7859']
Example Output: d, e, i, j, l, q, t, v

Example Input: ['8669', '4423', 's', '1761', 'p', 'h', 'q', 's', 'f', 'h', 'c', '5437', 'g', '7801', 'k', '6495', 'd', 'e', 'n', 't']
Example Output:
c, d, e, f, g, h, k, n, p, q, s, t