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: ['r', '9489', 'e', 'n', '6323', 'd', '3163', '265', '8587', '7891']

Output: d, e, n, r


Input: Consider Input: ['o', '1099', 'r', '8995', 'o', '2909']

Output: o, r


Input: Consider Input: ['4129', '8015', 'z', '5339', '5335', '5263', '3913', 'n', 'p', '7239', '8279', '9935', '3677', 'v', 'x', 'o', 'a', '1715', 'n', 'z', 'p', '6155', 'o', '1025', 'l', 'f', '3223', '971', '7995', 'x', 'm', 'g', 'a', 'c', 'j']


Output: a, c, f, g, j, l, m, n, o, p, v, x, z