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: ['g', '55', '153', '179', 'l', 'k', 'h', '21', '433', 'r', '53', '85', 'f', 'e']

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

PROBLEM: ['j', 'k']

SOLUTION: -1

PROBLEM: ['w', 'u', 'b', 'n', 'p', 'f', '275', 'f', 'g', '253']

SOLUTION:
2, 3, 5, 7