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: ['u', 'o', 'b', 'b', '5873', 'w', 'v', '4171', '7957', '3501', '2563', 'l', 'q']

Output: b, l, o, q, u, v, w


Input: Consider Input: ['5431', 'o', 'u', 'l', 'f', 'd', 'r', '1479', '9357', 's', 'v', '6399', 'b', '7937', 't', '8497', 'r', '131', 'h', 'c', 'v', '8879', 'k', 'r', '4687', 'l', '1065', 'r', 'w', 'l', '3305', '461', 'q', 'h', 'b', 'e', 'e', 'w', '5999']

Output: b, c, d, e, f, h, k, l, o, q, r, s, t, u, v, w


Input: Consider Input: ['4671', 'r', 'i', 'q', '7505', '1221', 'i', 'h', '4921', 'd', 'r', '529', 'w', 'j', '9477', 'y', 'z', 'j', 'w', 'z', 'c', 'k', '2739', 'b', '5403', 'c', '7563', 'v', '6465', 'd', 'o', '2825', 's', '4815', '4353', '5051']


Output: b, c, d, h, i, j, k, o, q, r, s, v, w, y, z