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: ['a', 'i', '7725', '2483', 'e', 'j', '5337', 'b', '6835', '8231', 'm', 'v', 'a', '1475', 'n', '5823', 's', 'm', '7313', '2841', '2585', '4673', 'u', '2083', 'z', 'd', 'p', '2117', 'i', '587', 'i', 'a', '2527', '7967', '6567', 'n', '6145', 'r', 'f']

Output: a, b, d, e, f, i, j, m, n, p, r, s, u, v, z


Input: Consider Input: ['o', '5503', '5837', '4539', '7631', 'm', '2641', 'p', '7901', '8117', 'z', '3373', '3215', 'v', 'a', '5949', 'w', '9049', 'd', 'a', 'l', 'v', 'l', 'n', 'w', 'r', 'j', '9031', '9609', '4209', 'c', '7453', '5855', '2883', '5941', 't', '4283', 'x', 'x', 'n', 'c']

Output: a, c, d, j, l, m, n, o, p, r, t, v, w, x, z


Input: Consider Input: ['y', 'd', 'n', 't', 's', 'c', '4071', '5091', '6941', 'm', 'j', '6317', 'y', 'n', '6175', 'y', '659', '5977', 'd', 's', 'z', '49', 'p', 'k', 'u', 'i', '8381', 'm', 'y', 'q', 'k']


Output: c, d, i, j, k, m, n, p, q, s, t, u, y, z