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', 'x', 'n', 'w', '8915', 'd', 'd', 'd', '6025', '7861']
Example Output: d, i, n, w, x

Example Input: ['r', 's', '3409', 'a', 'e', '6855', 'i', 'n', '8655', 's', 't', '8401', 'u', '9603', '8815', 'q', 'a', 'x', 'i', '8455', 'e', '5877', '3917', 'p']
Example Output: a, e, i, n, p, q, r, s, t, u, x

Example Input: ['l', '9487', '9625', 'k', '155', '8521', '391', '4605', '4493', 'i', 'q', 'm', 'v', '4075', 'f', 'b', 'l', 'k', 'i', 'd', 'r', 'i', '2143', '981', '4411', 't']
Example Output:
b, d, f, i, k, l, m, q, r, t, v