Problem 3 Regex

package A_TheExam;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class P03 {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        int n = Integer.parseInt(reader.readLine());

        List<String> attackerList = new ArrayList<>();
        List<String> destroyList = new ArrayList<>();
        String message = "";
        int newLetter = 0;
        String newStr = "";
        for (int i = 0; i < n; i++) {
            message = reader.readLine();

            int countLetters = 0;

            for (int j = 0; j < message.length(); j++) {
                //char test = message.charAt(j);
                if (message.charAt(j) == 's' ||
                        message.charAt(j) == 't' ||
                        message.charAt(j) == 'a' ||
                        message.charAt(j) == 'r' ||
                        message.charAt(j) == 'S' ||
                        message.charAt(j) == 'T' ||
                        message.charAt(j) == 'A' ||
                        message.charAt(j) == 'R') {

                    countLetters++;
                }
            }

            StringBuilder sb = new StringBuilder();
            for (int j = 0; j < message.length(); j++) {
                newLetter = message.charAt(j) - countLetters;
                StringBuilder newStrBuild = sb.append((char) newLetter);
                newStr = newStrBuild.toString();
            }

            String regex = "[^@\\-\\:\\!,\\>]*@([A-Za-z]+)" +
                    "[^@\\-\\:\\!,\\>]*\\:([0-9]+)" +
                    "[^@\\-\\:\\!,\\>]*\\!([AD])\\!" +
                    "[^@\\-\\:\\!,\\>]*(->)([0-9]+)";

            Pattern pattern = Pattern.compile(regex);
            Matcher matcher = pattern.matcher(newStr);


            while (matcher.find()) {
                String type = matcher.group(3);
                String name = matcher.group(1);

                if (type.equals("A")){
                    attackerList.add(name);
                    Collections.sort(attackerList);
                } else if (type.equals("D")) {
                    destroyList.add(name);
                    Collections.sort(destroyList);
                }
            }
        }

        System.out.printf("Attacked planets: %d%n", attackerList.size());

        attackerList
                .stream()
                .sorted((s1,s2)->s1.compareTo(s2))
                .forEach(s->System.out.printf("-> %s%n", s));

        System.out.printf("Destroyed planets: %d%n", destroyList.size());

        destroyList
                .stream()
                .sorted((s1,s2)->s1.compareTo(s2))
                .forEach(s->System.out.printf("-> %s%n", s));
    }
}