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: ['4397', '2685', '9539', '4343', '6697', '7693', 'g', 'c', '3587', '4691', 'j', '8931', '7397', '2103', '3431', 'u', 'l', 's', 'v', 'q', 'd', '1289', 'h', '1695', 'h', 'j', 'e', '1225', 'e', '7893', 'o', 'i', '3351']

Output: c, d, e, g, h, i, j, l, o, q, s, u, v


Input: Consider Input: ['1749', 'i', 'w', 'j', '3171', '1999', '1037', '4937', '7013', '3593', '287', 'o', 'i', 'j']

Output: i, j, o, w


Input: Consider Input: ['5175', '8691', 'y', '4119', '9527', '7405', 'b', '3371', 'x', 'a', 'v', 's', 'r', 'r', '6177', '5029', 'g', 't', '293', 'f', '7749', '2931', '2263', 'o', 'n', 'h', '9417', '8141', '1681', 'x', '6539', 'd', 'd', '4997', '1651', 'q', 'h', '7993', 'q', 'm', 'd', '2043']


Output: a, b, d, f, g, h, m, n, o, q, r, s, t, v, x, y