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.

Example Input: ['s', 'j', '6779', '1535', 'd', 'e', 'u', '3023', '241', '9115', 'h', '8003', '3755', 'q', 'm', '2725', 'x', 'y', 'n', 'm', 'j']
Example Output: d, e, h, j, m, n, q, s, u, x, y

Example Input: ['7561', 'r', '3419', 'k', 's', '5997', 'u', '6635', '7003', '8491', 'i', '9835', 'c', '8827', 'h', 'a', 'j', '7675', '1995', '1223']
Example Output: a, c, h, i, j, k, r, s, u

Example Input: ['a', 'g', 'o', 't', '1373', 'f', '7021', '8463', 'd', 'c', '4421', 'g', '3165', 'p', '9163', 'i', 'q', '8659', 'k', 'n', '7671', '4835', '3645', '3299', 'h', '6481', '9423', '3497', 'o', '9005', '2313', 'v', '6199', 'h', '5671', 'w', '5615', '2723', 'u', '3325', 't', 'a', '889', 'z']
Example Output:
a, c, d, f, g, h, i, k, n, o, p, q, t, u, v, w, z