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: ['2633', 'd', 'r', '8083', 'f', 'd', '5121', '8651', 'o', 'b', '811', '7551', 'x', 'p', 'm', 'v', 'm', '7833', '1959', 'y', 'p', '779', '1889']

Output: b, d, f, m, o, p, r, v, x, y


Input: Consider Input: ['4925', 'i', 'q', 'k', '7615', 'r', '7217', 'o', '8097', '9151']

Output: i, k, o, q, r


Input: Consider Input: ['m', '6999', '5957', 'x', '3085', '6521', 'j', '745', '8571', '9191', '3719', '8619', 'b', 'z', '3877', 'b', '1563', '4651', '6111', 'h', '5681', '7773', 'f', 'h', '7431', 'f', 'd', 't', 's', '6613']


Output: b, d, f, h, j, m, s, t, x, z