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: ['5761', '2289', '577', 't', '125', 'i', 'g', '9693', '747', 'd', '4829', '9587', 'f', 'k', 'w', 'v', '8607']

Output: d, f, g, i, k, t, v, w


Input: Consider Input: ['w', '5341', 'b', '6243', 'v', '877', '1087', '6763', '5241', '3369', '9119', 't', 'v', 'j', '8261', 'o', 'b']

Output: b, j, o, t, v, w


Input: Consider Input: ['8389', 'r', '7259', '6643', '2319', '9691', '5587', 'v', '3645', '7767', 'y', 'a', '4015', '3523', 'o', '9275', 'w', 'y', '1947', '107', '8073', '5511', 'm', 'c', 'm', 'w', '1105', 'c', '631', '3149', 'z', '3393']


Output: a, c, m, o, r, v, w, y, z