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: ['f', '217', '449', 't', 'j', '4097', '5561', '8317', '647', 'u', 'b', '7833', 'r', '9011', 'z', '2753', '2183', 'z', 'o', 'g', '7541', 'b', '8795', '327', 'v', 'e', 't', 'l', '4909', 'k', '7681', 'r']

Output: b, e, f, g, j, k, l, o, r, t, u, v, z


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: ['t', '9889', '7405', '9075', '6217', 't', '5367', '1081', 'f', 'q', 'm', '3479', 'h', '381', '1021', 'e', '515', '2741', '8021', '229', 'r', 'a', 's', 's', 'k', 'c', 'j', 'q', '3867', '5483', '1381', '445', 'u', 'e', '7093', '4549', 'c', 'z', 'g']


Output: a, c, e, f, g, h, j, k, m, q, r, s, t, u, z