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: ['m', 'z', 'd', '4667', 'v', '2881', '887', 's', '9861', 'd', '8821', '125', 't', '4493', '6749', '2983', '309', '6033', 'i', '3421', 'j', '4001']

Output: d, i, j, m, s, t, v, z


Input: Consider Input: ['8235', 't', '1695', '9899', '3633', 't', '1823', 'r', 'x']

Output: r, t, x


Input: Consider Input: ['7161', 'x', '9233', 's', 's', '3693', 'j', '8163', 'y', 'h', '427', 'n', '9381', 'j', '107', '2865', '809', '2785', '9285', 'o', 'k', 'm', 'k', 'p', 'l', 'j', 'w', '4287', 'm']


Output: h, j, k, l, m, n, o, p, s, w, x, y