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: ['u', 'i', '1185', '3795', '5417', 'k', 'b', '2629', '2635', 'z']

Output: b, i, k, u, z


Input: Consider Input: ['9351', 'v', 'h', 'z', 'g', 'f', 't', 'q', 'g', 'o', '4073', 'n', '6149', '1735', '157', 'm']

Output: f, g, h, m, n, o, q, t, v, z


Input: Consider Input: ['1885', 'h', '815', '6617', 'h', 'p', '9073', 'o', '4369', 's', '5613', 'e', '9227', '1913', 'l', '5145', 'z', 'z', '6393', '7155', '1223', '2613', '5729', '371', 'b', 'q', '5031', '2995', 'w', '8141', 'i', 'z', 'f', 'g', 'z', '8761', '8029', '929', 'm', 'l', '3239', 't', 'g']


Output: b, e, f, g, h, i, l, m, o, p, q, s, t, w, z