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: ['1985', '729', '169', '1299', 'l', 'z', '6809', '3083', 'w', 'f', '1989', 'z', '889', 'x', 'r', '1601']

Output: f, l, r, w, x, z


Input: Consider Input: ['789', '3603', '3517', '5831', 'z', 'q', 'w', 'l', '5701', '9503', '8169', '1123', 'e', '529', 'j', 'z', 'l', 'o', '3705', 'o', '5131', '6063', 'c', 'j', '6275', '7701']

Output: c, e, j, l, o, q, w, z


Input: Consider Input: ['p', '6597', '1537', 'x', '2867', 'b', '4839', 'b', '5191', 'h', 'w', 'w', 'w', 'y', '8723', 'i', '9153', '8719', 'g', '3303', '285']


Output: b, g, h, i, p, w, x, y