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: ['w', 'g', '1649', 'a', '2115', '6763', 'r', 't', 'l', 's', 'y', '5659', 'a', 'b']

Output: a, b, g, l, r, s, t, w, y


Input: Consider Input: ['9385', '4021', 'y', '9629', 'u', '7623', 'd', '5155', 'x', '2605', '8893', 'l', 'p', 'a', 'm', '6699', 'i', '4503', '6623', 'm', 'l', '6115', 'p', 'w', '9691', '811', '4769', '2659', 'x', 'c', '6513', '5499', 's', 'q', 'f', 'v', 'z', 'w', 'z', '1361']

Output: a, c, d, f, i, l, m, p, q, s, u, v, w, x, y, z


Input: Consider Input: ['p', 'g', 'b', '1037', 'k', 'n', 'j', '1819', 'k', 'q', 'y', 'd', 'a']


Output: a, b, d, g, j, k, n, p, q, y