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.

Example Input: ['r', 's', '2471', 'n', '635', 'k', '3551', '7041', '8765', '1221', '8439', '7773', '6471', 'u', 'p', '2093', '6479', '1435', '6881', 'a', 'y', 'm', 'r', '1627', 'w', 'k', 'b', '3095', '9059', '285', 'y', 'a', 'm', 'x', '637', 'i', '3407', 'e', 'e']
Example Output: a, b, e, i, k, m, n, p, r, s, u, w, x, y

Example Input: ['w', 'o', 'l', '5331', 'k', '9325', '6759', '7931', '8185', 'w', 'h', 'h', 'x', '4357', '6845', 'v', 'o', '8401', 'u', 'g', 'f', 'j', 'j', '2493', '4753', 'c', 'm', '1469', '4307', 'm', '2737', 'n', 'y']
Example Output: c, f, g, h, j, k, l, m, n, o, u, v, w, x, y

Example Input: ['7439', '3855', '9337', '6913', '831', 'w', 'c', 'z', '335', 'j', '2037', '8729', 'm', '6219', '1695', '9563', 'f', '237', 'g']
Example Output:
c, f, g, j, m, w, z