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: ['r', '135', 't', 'm', 'f', '329', '475', '243', 'z', 'q', '31', '141']

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

PROBLEM: ['o', 'f', 'm', 'w', 'w', 'y', 'b']

SOLUTION: -1

PROBLEM: ['g', 'q', '53', '167', 'j', '305']

SOLUTION:
0, 1, 3, 5, 6, 7