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: ['h', 'l', 'i', '1507', 'h', '409', '6777', 'u', '5563', '6113', '6513', '9949', '461', 'z', 'm', '2519', 'r', '4699', 'n', 'x', '4645']

Output: h, i, l, m, n, r, u, x, z


Input: Consider Input: ['j', '917', 'w', 't', '8873', '1431', '8059', '7041']

Output: j, t, w


Input: Consider Input: ['7001', 'v', '1615', '8105', '2071']


Output: v