04. Matching Brackets

package DPM;

import java.util.*;

public class Main {
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        String line = scan.nextLine();
        Deque<Integer> stack = new ArrayDeque<>();
        for (int i = 0; i < line.length(); i++) {
            char ch = line.charAt(i);

            if (ch == '(') {
                stack.push(i);
            }
            else if (ch == ')') {
                int startIndex = stack.pop();
                String contents =
                        line.substring(startIndex, i + 1);
                System.out.println(contents);
            }

        }
        }
}