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.

Example Input: ['6737', 'g', '9985', '5257', 'k', 't', '7863', 'y', '8319', 'l', 'o', '6505', '6531', 'z', '3055', '2943', '3625', 'h', '4867']
Example Output: g, h, k, l, o, t, y, z

Example Input: ['f', '6817', 'f', 'd', '3835', '3051', 'u', 'l', '7679', 'b', '3931', '1441', 'q', '8675', 's', '5487', 'y', '2279', 'x', 'y', '9513', '2875', '1771', '879', '2927', '3469', 'v', 't', 'k', '9991', '2565', '7345', '973', 'w', 'i', '6105']
Example Output: b, d, f, i, k, l, q, s, t, u, v, w, x, y

Example Input: ['4339', 'y', 't', '9083', '8011', 'o', 'z', '119', 'u', 'e', '8661', '8063', 'x', 'r', '4609', 'v', '8793', '9087', '2693', 'n', 't', 'w', 'b', '397', 'k', '7075', '5679', '6301', 'v', 'n', 's', '679', 'o', 't', 'h', 'r', 'g', '1929', '527', 'q', '6739', '1831', '5063', '7447', '7611']
Example Output:
b, e, g, h, k, n, o, q, r, s, t, u, v, w, x, y, z