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: ['4993', '6641', '3127', '9409', '8453', '5909', '6109', 'y', 'f', '6859', 'c', '3863', 't', '1221', '3689', 'w', 'h', '7947', 't', '5979', 'l', 'i', '1321', '3149', 'l', 'v', '3825', 'z', '9297', 'f', 'e', '7205', 'a', 'a', '2645', '391', '4965', 'w', 'h', '7715', '9409', '3603', '4147']
Example Output: a, c, e, f, h, i, l, t, v, w, y, z

Example Input: ['1657', 'u', '1849', '425', 'v', '6435', 'j', '2985', '921', '9553', '2621', 'i', '7103', 'd', '8563', 'l', 'b', '6727', '4235', 'n', '8021', 'd', 'z', '437', 'm', '5695', 't', '3421', 'e', 'a', '2941', '791', '1417', '9247', 'h']
Example Output: a, b, d, e, h, i, j, l, m, n, t, u, v, z

Example Input: ['3577', 'x', 'd', 'r', 'o', 'n', 'g', '2169', 'i', '5191', '9377', 'c', 'y', '39', 'v', 'h', 'a', '7893', 'p', '3549']
Example Output:
a, c, d, g, h, i, n, o, p, r, v, x, y