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: ['k', '217']

SOLUTION: 1, 2, 7

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

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

PROBLEM: ['e', '11', '137', '1', '447']

SOLUTION:
1, 3, 4, 7