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: ['5971', 'x', 'c']

Output: c, x


Input: Consider Input: ['y', 'b', 'r', 'f', '3745', 'n', '2921', '8133', 'r']

Output: b, f, n, r, y


Input: Consider Input: ['f', '9999', '9499', '7863', '2523', '3885', 'o', '3895', '2939', '7099', '6139', '973', '6131', '7821', 'r', 't', '3393', 'q', '7479', 's', 'r', '2743', 'r', '7939', 'b', 'p', '4631', '3019', 'n', '7565', '331', 'w', 'o', '235', '8331', 'j']


Output: b, f, j, n, o, p, q, r, s, t, w