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: ['e', '1251', 'y', '6689', '6389', 'h', 't', '503', '5093', 'e', '923', '7051', 'm', 'u', '4501', '3289', '6887', '8341', 'o', '3671', 'n', 'w', '7749', 's', 'j', 'o', '8429', 'q', 'v', 'p', 'd', 'g', 'i', 'f']

Output: d, e, f, g, h, i, j, m, n, o, p, q, s, t, u, v, w, y


Input: Consider Input: ['9271', '6393', '6005', 'x', '2301', '3999', 'p', 'z', 'j', '1033', '7555', 'r', 'r', 'y', '8917', '5939', '4031', 'e', '8095', 'g', '6095', 'a', '4133', '6471', '2129', '8021', '1093', 't', '8805', '545', 'k', '3249', 'l', '1561', '9909', 's', '1963', 'o']

Output: a, e, g, j, k, l, o, p, r, s, t, x, y, z


Input: Consider Input: ['2169', '3233', 'h', 'x', '5155', '2405', '4277', '3295', '4017', '4207', '3863', 'm', '9489', '4835', 'x', '1053', 'x', '5357', '8785', '213', '269', '4819', 'd', '1129', '1961', '7871', '1301', 'n', '7947', '6513', '5493', 'q', '6371', 'o', 'a']


Output: a, d, h, m, n, o, q, x