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: ['469', 'y', 'j', 'u', '475', 'k', 'k']

SOLUTION: 4, 5, 6, 7, 9

PROBLEM: ['85', '53', '43', 'j', 'e', '443', '231', 'z', 'f', 'v', '235', '377']

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

PROBLEM: ['c', 's', 'p', 'p', 'j', '105', '35', '315', 'o', 'r', '285', '183']

SOLUTION:
0, 1, 2, 3, 5, 8