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: ['5161', 'v', 'y', '6005', 'y', 'l', '5451', 'z', 'j', 'd', '4597', '9319', '1241', 'g', 'f', 'b', 'g', '683', '763', 'm']

Output: b, d, f, g, j, l, m, v, y, z


Input: Consider Input: ['7997', 'm']

Output: m


Input: Consider Input: ['p', '1199', 'b', 'z', '8777', 'g', 'b', 'j', '4103', '1775', 'a', 'q', 'v', 'z', 'i', '7901', '6675', 'c', 't', '2731', '9711', '8321', '9651', '3603', '9369', 't', '3299', '5437', 'u', '4985', '7893']


Output: a, b, c, g, i, j, p, q, t, u, v, z