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.

Input: Consider 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']

Output: a, c, e, f, h, i, l, t, v, w, y, z


Input: Consider Input: ['5011', 'l', '925', 'e', 'b', '3077', 'm', '4541', '781']

Output: b, e, l, m


Input: Consider Input: ['d', '4609', '3597', 'c', '3949', '4077', '4979', '8193', 'e', '2149', 'm', 'd', '4955', 'y']


Output: c, d, e, m, y