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: ['1749', 'i', 'w', 'j', '3171', '1999', '1037', '4937', '7013', '3593', '287', 'o', 'i', 'j']

Output: i, j, o, w


Input: Consider Input: ['c', '1693', 'l', 'u', 'x', '3609', 'h', '4159']

Output: c, h, l, u, x


Input: Consider Input: ['i', '6413', 'g', '1415', 'l', 'l', 'a', '8089', 'e', 'i', 'k', '4125', 'a', '7659', 'h', 'c', '8039']


Output: a, c, e, g, h, i, k, l