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: ['z', '3219', '6399', '2357', '7597', '357', 'k', 'k', 'u', 'd', '6115', 'w', '2921', '8809']

Output: d, k, u, w, z


Input: Consider Input: ['p', 'p', '7899', 'u', '971', '7289', 't', '5217', 'k', 'z', 'y', 'y', '6905', '9499', '4085', 'x', '955', 'v', 'j', '9049', '7927', '1757', '193', '2181']

Output: j, k, p, t, u, v, x, y, z


Input: Consider Input: ['8913', 'b', 'x', 'p', '3135', '9303', '7763', 'y', 'h', 'm', 'c', 'w', '2787', 'h', 'h', 'd', '1749', '297', 'u', '8641', '8395', 'o', '2407', '5069', '4775', 'o', 'l', 'e', 'r', 'd', 'm', '9815', '4873', 'c', '9869', '9325', '705', 'i', '5389']


Output: b, c, d, e, h, i, l, m, o, p, r, u, w, x, y