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: ['353', '195', '297', '175', 'u', 'p', 'r', 'l']

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

PROBLEM: ['293', '473', '79', 'j', '455', '285', 'k', 'd', '379', '249', '73', '229']

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

PROBLEM: ['j', 'm', 'k', 'f', '87', 'h', 'y']

SOLUTION:
7, 8