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: ['8739', 'v', 'm', '6277', 'l', 's', '109', '8057', '3835', 'd', 'u', 'f', 'w', 'd', 'p', '7705', '3643', '4455', 'u', 'p', 'u', '9407', 'g', 'w', '595', 'z', '6827', '6879', 'w', 'w', '6973', 'm', 'e', '1553', 'v', '3529', '8953', '3903', '5713', '8249', 'e', '1113', 'b', 't', 'r']

Output: b, d, e, f, g, l, m, p, r, s, t, u, v, w, z


Input: Consider Input: ['j', '917', 'w', 't', '8873', '1431', '8059', '7041']

Output: j, t, w


Input: Consider Input: ['j', 'h', 'x', '375', 'f', 'e', 'v', 'd', 'c', '4735', 'q', '1563', 's', '7819', '5881', '8271']


Output: c, d, e, f, h, j, q, s, v, x