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: ['2527', '9123', '8717']
Example Output: -1

Example Input: ['9923', 'x', '1901', 'v', '1459', '7503', '3829', '4929', 'k', 'c', '3329', '8793', 'n', 'a', '7249', 'b', 'l', 'l', 'm', 'p', 'b', 'a']
Example Output: a, b, c, k, l, m, n, p, v, x

Example Input: ['1619', 'y', 'q', '5049', '7401', 'r', '4429', 'a', 'j', 'p', '963', '9315', 'z', 'w', '6531', '7961', '7087', 'c', '965', '6007', '1871', 't', '7499', 'y', '7103', '6949', '8037', 'y', 'q', '6767', '5583', 's', 'g', '269', 'h', '757', '1657', 'q', '4183', 'k', 'k', 'm']
Example Output:
a, c, g, h, j, k, m, p, q, r, s, t, w, y, z