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: ['2957', '9101', '2365', 'j', 'a', '8883', 'q', 'i', 'i', 'v', 'n', 'g', 'f', 'z', '4677', 's', 'p', 'q', '2809', '6443', 'n', 'k', '3767', '4183', '6483', 'l', 'x', '8199', 'c', '97', '7181']
A: 
a, c, f, g, i, j, k, l, n, p, q, s, v, x, z