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: ['j', '425', '6223', '6631', 'y', '7649', 'r', 'a', '7933', '7947', 'l', 'l', '8755', 'g', 'b', '3351', '49', 'v', 'm', 'x', '3291', '1007', '1401', 'z', 'q', 'a']
Example Output: a, b, g, j, l, m, q, r, v, x, y, z

Example Input: ['5553', 'f', '3881', '8867', 's', 'd', 'a', '375', '7889', '3949', '2905', 'w', 'q', 'q', 'd', '4203', 'i', '2601', 'y', 'p', 'k']
Example Output: a, d, f, i, k, p, q, s, w, y

Example Input: ['5751', '103', 'j', '2391', '3391', '4863', '9597', 't', 'm', '6401', 'i', 'a', 'a', '793', 'r', '2953', '8825', 'd', '7477', '9601', 'a', 's', 'r', 'w', '1647', 'b', 'c', '9585', 'b', 'i']
Example Output:
a, b, c, d, i, j, m, r, s, t, w