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: ['2409', 'q', 'w', 'e', 'x', '4737', 'w']

Output: e, q, w, x


Input: Consider Input: ['o', 'c', '6469', 'x', '8815', '4441', '6193', 'u', 'm', 'a', '9879', 'p', '8335', 'c', 'z']

Output: a, c, m, o, p, u, x, z


Input: Consider Input: ['7587', 'p', 'j', 'z', 'o', '5999', '5597', '4411', 'q', '6617', '2721', 'w', 'c', 'u', '2153', '8187', 'h', '4063', '6415', 'i', '4361', 'y', '5053', '4473', '7825', 'l', '3385', '8101', 'u', 's', 'r', 't', '8739', 'x', 'y', 'u']


Output: c, h, i, j, l, o, p, q, r, s, t, u, w, x, y, z