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: ['x', 'b', '1467', 'y', '2101', 'y', 'm', '2745', 'z', '429', '7523', 'e', 'f']

Output: b, e, f, m, x, y, z


Input: Consider Input: ['n', 'h', 'h', 'e', 'p', '1265', '4853', '9433', '1227', '1619', '6381', 'o', '8285', 'k', 'u', '7471', 'm', '6887', '6579', '5813', '5563', '8535', 'n', '3743', 'h', 't', '4497', '2791', 'e', 'v', '6769', '7969', 'x', 't', 'x', 'q']

Output: e, h, k, m, n, o, p, q, t, u, v, x


Input: Consider Input: ['1043', '6657', '9239', '4787', '2523', 's', '9217', '9835', 'r', '3411', '2177', '7239', 'z', '8457', 'i', 'g', 'g', '3051', '6595', '2661', 'm', '6361', '303', '3069', 't', '3967', '6121', 'e', 'x', 'v', 'q', '7451']


Output: e, g, i, m, q, r, s, t, v, x, z