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: ['f', '9027', 'z', '9601', 'w', '7747', '1135', 'j', '1871', 'd', 'u', 'f', 'd', 'x', 'k', '2009', 't', '4625', 'm', '1619', 'm', 'm', '3107', 'x', '3957', '2495', 'j', '201', 'a', '4635', 'r', '7407', 'b', 'r', 'z']

Output: a, b, d, f, j, k, m, r, t, u, w, x, z


Input: Consider Input: ['1429', '7273']

Output: -1


Input: Consider Input: ['r', 'e', 'p', '3163', 'o', '5085', 'c', 'j', '9497', 'h', '6663', 'i', 'e', 'm', '8015', 'e', '667', 'k', '2887', 'd', 'o', 'w', 'l', '585', 'a', '9939', 'r', '3411', 'a', 'n', 'b', '4313', '6251', '949', '2735', 'n', '103', 'r', 'b', 'u', 'f', '5569']


Output: a, b, c, d, e, f, h, i, j, k, l, m, n, o, p, r, u, w