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: ['r', '273', 'h', '421', 'k', 'r', 'k', 't', 'x', 's', 'j']

Answer: 1, 2, 3, 4, 7


Question: ['t', '361', 'o', 'j', '395', 'u', '211', 'a', 'i', 'i', '375', 'h', '451']

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


Question: ['141', '245', '189', '479', '189', 'b', '55', '43']

Answer:
1, 2, 3, 4, 5, 7, 8, 9