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: ['8495', 'p', 'j', 'm', 'n', '9115', '1183', 'r', 'r', '8735', 'a', 'i', 'k', 'p', '8927', 'r', '9283', '9563', 'g', '2503', 'h', '1091', '5257', 'a', '3061', '2835', 'l', 'w', 'j', '7617', '8793', '7463', 'h', '8467', '7337', 'b', '4655', 'd']

Output: a, b, d, g, h, i, j, k, l, m, n, p, r, w


Input: Consider Input: ['i', 'x', 'n', 'w', '8915', 'd', 'd', 'd', '6025', '7861']

Output: d, i, n, w, x


Input: Consider Input: ['w', '5765', 'q', 'g', 'e', 'c', 'u', 'a', 'r', '179', 'l', 'w', '6717', '1315', '153', 'o', 'r', '963', 'h', 'm', 'p', '7613', 'o', 's', 'y', 'e', '7175', 't', '9909', 'j', 'a', '3241', '2111', '5255', 'j', '6427', 'd', 'm', 'h', 'a', '1565', 'l', '4125', 'c', '8245']


Output: a, c, d, e, g, h, j, l, m, o, p, q, r, s, t, u, w, y