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: ['s', 'c', 'e', '2457', '9413', 'r', '9949', 's', 'z', 'e', 'a', 'o', '7207']

Output: a, c, e, o, r, s, z


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: ['2271', '9537', '263', 'o', '2469', '2809', 'q', 't', '6053', '5937', 'c', '4737', 'q', 'h', 'd', 'q', 'z', '9031', 'a', 'v', 's', 'm', '6441', '4227', 'i', '7801', '2199', '1309', 'n', '8259', '6497', '1285', '1331', 'e', '809', 't', 'r', '5051']


Output: a, c, d, e, h, i, m, n, o, q, r, s, t, v, z