In this task, you are given an input list A. You need to extract and sort the unique digits used in the list in ascending order. Return -1 if there is no digit in the list.
--------
Question: ['u', '73', 'x', 'f', 'e', '187', 'x', 'i', '215', '1', 'z', '129', '89', 'f', 'i']

Answer: 1, 2, 3, 5, 7, 8, 9


Question: ['o', '235', '479', 'e', '199', 'c', '25', '59', 'g', '415', '201', '129', 'a', 'i', 'c']

Answer: 0, 1, 2, 3, 4, 5, 7, 9


Question: ['n', '199', '59', 'x', 'h', 'b', 'y', '423', '209', '37', '317', '467', '25']

Answer:
0, 1, 2, 3, 4, 5, 6, 7, 9