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', 'c', '381', '149', '67', '67', '197', 'i', '289', '491', 'c', 'b']

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

PROBLEM: ['287', 'y', 'b', '79', '39', 'l']

SOLUTION: 2, 3, 7, 8, 9

PROBLEM: ['d', 'd', '237', 'k']

SOLUTION:
2, 3, 7