TASK DEFINITION: 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.
PROBLEM: ['t', 'u', 'e', 'a', '369', 'e', 'r', 'm']

SOLUTION: 3, 6, 9

PROBLEM: ['455', '447', 'x', '479', 'b', '267', '339', '29', '267']

SOLUTION: 2, 3, 4, 5, 6, 7, 9

PROBLEM: ['295', '341', 'f', '97', 'x', '209', 'v', 'k', '149', '173', '463']

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