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: ['1749', 'i', 'w', 'j', '3171', '1999', '1037', '4937', '7013', '3593', '287', 'o', 'i', 'j']
Example Output: i, j, o, w

Example Input: ['z', '8407', 'y', 'h', '1377', '3511', '1449', 'z', '3991', 'n', 'x', 't', 'h', '6389', '8049', '6091', '7787', 'p', 'l', '5815', 'k', 'e', 's', 'a', '9491', 'w', '1909', '4801', '4725', 'i']
Example Output: a, e, h, i, k, l, n, p, s, t, w, x, y, z

Example Input: ['a', 't', 'y', 'i', 'g', 'e', '3043', '1713', '6947', '59', '8997', '6487', '4579', 'e', '3219', '7159', '1413', '2361', 'l', '9553', 'i', '9741', '1865', 'b', 'v']
Example Output:
a, b, e, g, i, l, t, v, y