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: ['6249', '1235']

Output: -1


Input: Consider Input: ['1657', 'u', '1849', '425', 'v', '6435', 'j', '2985', '921', '9553', '2621', 'i', '7103', 'd', '8563', 'l', 'b', '6727', '4235', 'n', '8021', 'd', 'z', '437', 'm', '5695', 't', '3421', 'e', 'a', '2941', '791', '1417', '9247', 'h']

Output: a, b, d, e, h, i, j, l, m, n, t, u, v, z


Input: Consider Input: ['509', '2707', 'l', '3369', '263', 'o', '1001', 'g', '4725', '7633', '6879', 'd', 'c', '2063', '7899', '839', '2655', 'r', '617', 'v', '8739', '2247', '4263', 'f', 'p', 'o', '4601', 'a', 'g', 'c', 'h', 'q']


Output: a, c, d, f, g, h, l, o, p, q, r, v