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: ['477', '3931', 'g', '5967', 'm', '9845', '1607', 'a', '1749', 'k', 'j', '7945', '9125', 'v', 'n', 's', '5185', '1117', '17', 'x', '4149']

Output: a, g, j, k, m, n, s, v, x


Input: Consider Input: ['u', '1343', 'd', 'c', '9567', 'e', 'd', 'y', 's', '4199', '3217', '2937', '9345', 'd', 'l', '9875', '5987', 'p', '2585', '5843', '9643', '2423', 'e', 'l', 's', '3503', 'b', 'w', '9685', 'p', '6055', 'k', 'e', 'e', 't', '865', '6071', 'j', '3439', 't']

Output: b, c, d, e, j, k, l, p, s, t, u, w, y


Input: Consider Input: ['353', 'x', 'e', 'm', '6887', 'v', 's', '8331', '6153', 'h', 'w', 'w', '2893', '7227', '9491', 'w', '1129']


Output: e, h, m, s, v, w, x