public static void main(String[] args) throws IOException {
    try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in))) {
      int q = Integer.parseInt(bufferedReader.readLine().trim());
      List<int[]> queries = new ArrayList<>(q);
      Pattern p  = Pattern.compile("^(\\d+)\\s+(\\d+)\\s*$");
      for (int i = 0; i < q; i++) {
        int[] query = new int[2];
        Matcher m = p.matcher(bufferedReader.readLine());
        if (m.matches()) {
          query[0] = Integer.parseInt(m.group(1));
          query[1] = Integer.parseInt(m.group(2));
          queries.add(query);
        }
      }
      List<Integer> ans = freqQuery(queries);
      try (BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")))) {
        bufferedWriter.write(
                ans.stream()
                        .map(Object::toString)
                        .collect(joining("\n"))
                        + "\n");
      }
    }
  }

static List<Integer> freqQuery(List<int[]> queries) {