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: ['8527', 'p', '4697', '8415', 'v', 'l', '2669', '2649', '4349', '4201', 'r', '7573', '2041', 'f', '8047', 'u', 'm', 'm', 'j', '5695']

Output: f, j, l, m, p, r, u, v


Input: Consider Input: ['4927', 'h', 'x', '4719', 'j', 'f', '7797', 'l', 'i', 'q', 'x', 'i', 'k', '3215', 'k', '1625', 'g', 't', 'i', 'w', 'n', '6659', '8355', '831', 'h', '9723']

Output: f, g, h, i, j, k, l, n, q, t, w, x


Input: Consider Input: ['p', '8275', '4087', '533', 't', '6647', 'w', 'j', '9899', 'b', 'l', 'd', 'b', '4013', '8657', 'x', 'i', 'n', 't', '5505', 'j', '7483', 'k', 'n', '5801', '8965', '8273', '6901', 'f', 'h', '1549', 'k', 'd', 'o', 'p', '2027']


Output: b, d, f, h, i, j, k, l, n, o, p, t, w, x