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: ['2593', '1835', '5089', 'v', '9723', 'f', '9279', '4257', '2175', '655', 'q', 's', 'v', 'j', 'm', '4471', '6419', '1685', '2793', 'x', '509', 's', '4833', '2125', 'b', '6379', '1075']

Output: b, f, j, m, q, s, v, x


Input: Consider Input: ['5499', 'v', '6507', 'w', 'c', '8431', '8861', '5391', '4765', '4295', '1865', '485', '7255', '1205', 'p', 'w', 'q', '6833', '959', 'a', 'i', '2599', '7779', 'h', '9651', 'g', 'r', 'e', 'u', '4511', '1587', '5601', '8287', '5685', 'u', 'g', '2853', 'p', 'k']

Output: a, c, e, g, h, i, k, p, q, r, u, v, w


Input: Consider Input: ['f', '7627', 'p', 'u', '3457', 'a', '4183', '9931', 'g', '4395', '4665', 'w', 'm', 'z', '9671', '961', '5353', 'j', 'i', '1999', '5195', 'q', 'l', '35', 'u', '8521', 'j', '6327', '5477', '665', '9841', '131', '3811', 'l', 'q', 'f', '3221', 'k', '9413', 'l', 'k', '2803', 'i']


Output: a, f, g, i, j, k, l, m, p, q, u, w, z