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: ['7055', '2573', '1713', 'x', 'm']
Example Output: m, x

Example Input: ['v', '5433', 'v', '6749', '7491', 'i', 'm', 'e', '5815', '8423', '833', '7359', 'm', 'i', 'f', 'u', 'p', 'j', 't', '3171', '6165', 'q', 'a', '9475', 'm', 'q', '5995', '8443']
Example Output: a, e, f, i, j, m, p, q, t, u, v

Example Input: ['w', '5', 'd', 'w', '8257', 'x', 'p', '3219', '5767', '6375', '9349', 't', 'a', '8119', 'c']
Example Output:
a, c, d, p, t, w, x