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: ['o', '4167', 'b', '1651', '8327', '9219', 'o', 'v', '5841', '6057', 'i', 'q', 'o', 'r', 'a', '7069', 'y', 'h', 'd', '3775', 'j', 't', '3663', '55', '7117', 'e', 'u', 'm', '931', '5777', '8773', '4891']

Output: a, b, d, e, h, i, j, m, o, q, r, t, u, v, y


Input: Consider Input: ['1627', 'r', '2429', 'b', '4451', 's', 'k', 'm', '269', 'l', '709', 's', 'q', '985', 'x', 'j', 'k', 'k', '6603', 'v', '9497', '477', '5803', 'c', 't', 'f', '3189', '6419', '8561', '5709', 'u', 'z', '5717', '9711', 'w', 'y', 'm', 'v']

Output: b, c, f, j, k, l, m, q, r, s, t, u, v, w, x, y, z


Input: Consider Input: ['v', 'o', 'a', 'r', 'u', '3493', '7039', 'e', 'e', 'w', 'p', 'i', '27', 'i', 'o', 'c', 'j', '6283']


Output: a, c, e, i, j, o, p, r, u, v, w