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: ['1627', 'r', '2429', 'b', '4451', 's', 'k', 'm', '269', 'l', '709', 's', 'q', '985', 'x', 'j', 'k', 'k', '6603', 'v', '9497', '477', '5803', 'c', 't', 'f', '3189', '6419', '8561', '5709', 'u', 'z', '5717', '9711', 'w', 'y', 'm', 'v']

Output: b, c, f, j, k, l, m, q, r, s, t, u, v, w, x, y, z


Input: Consider Input: ['v', 'd', '3805', '8031', '3327', 'c', 'n', '6153', '2705', 'w', '5675', '6543', 'm', 'v', 'y', 'd', '2943', '4423', '515', '4501', 'y', '9377', 'j', 'i', 'f', '4749', 'o', 'r', '2605', 'm', '117', 'o', '9197', 't', 'l', '4145']

Output: c, d, f, i, j, l, m, n, o, r, t, v, w, y


Input: Consider Input: ['1545', '1165', 't', 'c', 'g', 'e', 'd', 'o', 'u', 'v', 'h', 'r', '8587', '6195', '4649', 's', 'a', 'l', 'g', '1747', '4635', '8037', 'p', 'v']


Output: a, c, d, e, g, h, l, o, p, r, s, t, u, v