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: ['5039', '2227', 't', 'o', '3313', 'm', 'v', '637', '6773', 'v', 'c', 'l', 'y', 'u', '3823', '9669', 'k', 'h', '3589', 'b', 'i', '3833', 's', 'm', '8201', 'u', '3143', 'k', '4111', '9769', '425', '4339', '209', 'c', 'c', '669', '8201', 'u', '7443', '2387', '6919', 'b', 'b', '2873']

Output: b, c, h, i, k, l, m, o, s, t, u, v, y


Input: Consider Input: ['z', '3219', '6399', '2357', '7597', '357', 'k', 'k', 'u', 'd', '6115', 'w', '2921', '8809']

Output: d, k, u, w, z


Input: Consider Input: ['9279', '1523', 'x', '2511', 'y', '3017', '2903', '8665', '1041', 'o', '9379', 's', '2073', 'q', '5469', '3317', '2089', 'i', '9019', '5585', 'e', '1393', 'e', '6781']


Output: e, i, o, q, s, x, y