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', '251', 'b', '241', 'z', '255']

SOLUTION: 1, 2, 4, 5

PROBLEM: ['227', '161', '389', 'g', 'g', 'i', 'm', '199', '487', '65', '341', '377', 'x', 'r']

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

PROBLEM: ['221', 'm', '181', 'r', '369']

SOLUTION:
1, 2, 3, 6, 8, 9