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: ['e', '313', '259', 'i', 'h']

SOLUTION: 1, 2, 3, 5, 9

PROBLEM: ['187', '461', 'b']

SOLUTION: 1, 4, 6, 7, 8

PROBLEM: ['g', '75', '241', '199', '375', '101', '187', '445', 'm', '257', '65']

SOLUTION:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9