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: ['n', 'w', '6735', '3427', '6115', 'q', '7851', '3645', 'g', '6825', '6515', '4885', 'z']
Example Output: g, n, q, w, z

Example Input: ['m', '6537', '4063', '6413', 'k', 'd', '2479', 'p', '2251', 'q', '7079', 'r', 'd', 'p', '3347', '1391', '9847', '4487', 'u', '6951', '5285', '5837', '6747', 'r', 's', 'c', 'x', 'b', 'q', 'y', 'd', '331', '679', 'v', '1919', 'f', 'p', '1267', '3151']
Example Output: b, c, d, f, k, m, p, q, r, s, u, v, x, y

Example Input: ['7665', 's', 't', '2607', 'f', 'g', '3015', 'r', 'g', 'm', 'e', '9645', '8723', 'u', '2715', 'g', 'd', '8617', '367', 'h', 'q', '3541', '767', 'k', 'd', '2555', 's', '5293', 'n', '579']
Example Output:
d, e, f, g, h, k, m, n, q, r, s, t, u