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: ['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: ['163', 'x', 'g', '5997', 'm', 'l', '7225', '7907', '375', 'y', 'a', 'j', 'c', 'j', '7755', '147', 'h', '3845', 'y', 's', 'h', 'u', '8737', '6091', 'j', 'f', 'c', '7395', '881', '1771', 'y', '3691', 'h']

Output: a, c, f, g, h, j, l, m, s, u, x, y


Input: Consider Input: ['7351', 'l', 'm', 'e', 'd', 'x', 'c', 'y', 'm', '5771', '2295', '8049', 'k', '9399', '4203', '5401', 'c', 'c', 'z', 'o', '4319']


Output: c, d, e, k, l, m, o, x, y, z