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: ['t', 'u', 'y', 'y', 'b', 'x', 'q', '3713', '2679']

Output: b, q, t, u, x, y


Input: Consider Input: ['3117', 'i', 'd', '7537', 'i', 'q', '4649', '7263', '3655', 'd', 'x', '8569', 'g', '2389', '3933', '7099', '563', '3055', '9941', 'm', 'c', '3529', '3577', 'x', 's', 's', '6153', '1731', '9679', 'f', '8839', '5183', '5', '6433']

Output: c, d, f, g, i, m, q, s, x


Input: Consider Input: ['c', '5037', 'b', '5589', 'm', 'y', 'k', '4577', '9121', 'z', 'w', '5349', '1831']


Output: b, c, k, m, w, y, z