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: ['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']

Output: a, e, f, i, j, m, p, q, t, u, v


Input: Consider Input: ['3395', '7471', 'n', '9537', '1255', '1997', '3085', '4863', '9797', '4275', 'k', 'f', '8973', '3939', 'p', 'q', '4977', '6231', '8745']

Output: f, k, n, p, q


Input: Consider Input: ['6443', '1973', '6233', 'c', '3171', 'g', 'o', 'r', '2869', 'b', 'q', 'n', '6019', '1859', 'i']


Output: b, c, g, i, n, o, q, r