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: ['f', '253', '211', '85', 'm', 'y', 'l', 'r', 't', 'm', '193', 'p', '415', 'h', 'h']

SOLUTION: 1, 2, 3, 4, 5, 8, 9

PROBLEM: ['459', 'd', '473', 'i', 'l', 's']

SOLUTION: 3, 4, 5, 7, 9

PROBLEM: ['267', '417', '247', 'u']

SOLUTION:
1, 2, 4, 6, 7