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: ['v', '2989', 'z', '7843', 'e', '9923', 'y', 'b', '7611', 'u', 'u', '6227', '3145', 'w', '6451', 'g', '3129', 'o', 'r', 'z', '8349', 'u', 'h', 'd', 'g', 'a']

Output: a, b, d, e, g, h, o, r, u, v, w, y, z


Input: Consider Input: ['2741', '2541', '8943', 'l', '4047', '2211', 'p', 'e', 't', '7645', '9771', 'f', '5063', '2303', '6097', '5089', 'd', 'e', '1409', '3125', '2171', 'g', '1247', '4045', 'v', 'h', 'u', '2587', '5207', '5553', 'g', 'd', '6891', 'e', '2471', '2435']

Output: d, e, f, g, h, l, p, t, u, v


Input: Consider Input: ['c', '2761', '553', 'c', '1563', 'm', 'r', '913', 'y', 'b', '6349', 's', 'n', 'c', '4923', 'i', 's', '1503']


Output: b, c, i, m, n, r, s, y