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.
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Question: ['469', 'y', 'j', 'u', '475', 'k', 'k']

Answer: 4, 5, 6, 7, 9


Question: ['167', '229', '439', '389', '483', '207']

Answer: 0, 1, 2, 3, 4, 6, 7, 8, 9


Question: ['e', '367', '337', '225', 'x', 'f', 'v', '79', 'b', 'u', '161', '23']

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