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: ['5761', '2289', '577', 't', '125', 'i', 'g', '9693', '747', 'd', '4829', '9587', 'f', 'k', 'w', 'v', '8607']

Output: d, f, g, i, k, t, v, w


Input: Consider Input: ['w', '5341', 'b', '6243', 'v', '877', '1087', '6763', '5241', '3369', '9119', 't', 'v', 'j', '8261', 'o', 'b']

Output: b, j, o, t, v, w


Input: Consider Input: ['j', 'c', 'b', '8595', '4147', 'l', 'n', 'l', '1963', 'm', '249', 'h', '4033', '4233', '4375', 'z', '3319', 'x', '6329', 'm', 'f', '7423', 'g']


Output: b, c, f, g, h, j, l, m, n, x, z