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', '419', 'f']

SOLUTION: 1, 4, 9

PROBLEM: ['103', '431', 'z', '99', 'h', 'c', 'a', '433', '55', 'k', 'a']

SOLUTION: 0, 1, 3, 4, 5, 9

PROBLEM: ['e', 'i', '469', 'd', '29']

SOLUTION:
2, 4, 6, 9