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.

Q: ['6249', '1235']

A: -1
****
Q: ['m', 'z', 'd', '4667', 'v', '2881', '887', 's', '9861', 'd', '8821', '125', 't', '4493', '6749', '2983', '309', '6033', 'i', '3421', 'j', '4001']

A: d, i, j, m, s, t, v, z
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Q: ['i', 't', '8931', '2069', 'c', 'l', '1099', '8487', 't', 'r']

A:
c, i, l, r, t
****