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: ['s', '6723', 'l', '1573', '1129', 'n', '4277', '5003', 'y', '7563', 'c', '6747', '3105', 's', '3593', '8417', '8253', '4157', 'w', 'f', 'z', 'd', '9685', '1033', 'h', '4893', 't', 'j', '6821', 'z', 'a', 'u', '591', 'o', '1087', '2147', '1223', '2339', 'i', 'y', '9307', 'x', 'z', 'r', 'y']

Output: a, c, d, f, h, i, j, l, n, o, r, s, t, u, w, x, y, z


Input: Consider Input: ['4123', '1397', '103', 'w', 't', 'j', '233', '7239', 'b', 'n', 't', '6273', 'l', '1167', '8389', '5609', '9029', '7741', 'o', 'p', '6547', '5593', 'd', '8401', 's', '4243', 's', 'u', 'm', '6659', '5691', '2105', '8897']

Output: b, d, j, l, m, n, o, p, s, t, u, w


Input: Consider Input: ['1235', 'w', 'b', '209', 'r', '1813', 'w', 'l', 'p', 'h', '803', '2403', 'l', 'w', '5809', '209', '8017', '7137', '9561', 'k', 'q', 'h', '5451', '8695', '4515', '9941', 'm', 'w', 'j', '1951', '821', '9355', 'b']


Output: b, h, j, k, l, m, p, q, r, w