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: ['h', 'u', 'y', '7677', '9441', '1769', 'v', '1433', 'l', '7739', 'a', '8305', 'n', 'a', '6711', '3161', 'e', 'u', '993', '2211', '4011', 'q', 'o']
Example Output: a, e, h, l, n, o, q, u, v, y

Example Input: ['9013', 'e', 'm', 'p', 'k', '161', 'k']
Example Output: e, k, m, p

Example Input: ['i', 'n', 'c', 'w', '6199', 'p', '7619', '139', '409', 'g', '4205', 'o', 'i', '9491', 'c', '1901', 'i', '9363', '4015', 'j', '6507', '8365', 'h', '2105', 'y', '6357', '8471', 'j', '451', '6657', '5263', 'x', 'w']
Example Output:
c, g, h, i, j, n, o, p, w, x, y