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: ['w', '5341', 'b', '6243', 'v', '877', '1087', '6763', '5241', '3369', '9119', 't', 'v', 'j', '8261', 'o', 'b']

Output: b, j, o, t, v, w


Input: Consider Input: ['3019', 'g', 'q', 'u', '611', 'z', '3671', '8119', '1679', 'h', '2631', '655', 'k', '2837', 'e', 'f', 'e', 'f']

Output: e, f, g, h, k, q, u, z


Input: Consider Input: ['8243', 'p', 'q', 'c', '4503', '9037', 'z', 'w', '5355', '9147', 'b', 'n', '3737', 'o', 'k', '3779', '6865', '1313', 'e', 'y', '5121', '1939', '6609', '3633', '7815', 'v', 'z', 'h', '5219', 'h', 'v', 'a', 'i', 'r', 'l', '3467', '9229']


Output: a, b, c, e, h, i, k, l, n, o, p, q, r, v, w, y, z