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: ['8235', 't', '1695', '9899', '3633', 't', '1823', 'r', 'x']

Output: r, t, x


Input: Consider Input: ['3627', '2051', '3203', 'c', 'r', 'a', '1453', 'e', 'z', 't', '1093', '4651', 'a', 'f', '8159', '9623', 'l', 't', 'r', '6963', '7071', '8103', '3493', 'y', '2369', '609', '2011', 'f', '187', 'f', 'c']

Output: a, c, e, f, l, r, t, y, z


Input: Consider Input: ['f', 'b', 't', 'f', '6621', '5241', '6535', '8675', 'b', 'x', '8449', '4425', 'c', '2911', '6289']


Output: b, c, f, t, x