TagSort

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;
import java.util.TreeMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

enum Tag {
  タグa, タグb, タグc, タグd, タグe, タグf, タグg, タグh, タグi, タグj, タグk, タグl;
}

class TagAndAux implements Comparable<TagAndAux> {
  public final Tag tag;
  public final String aux;

  public TagAndAux(Tag tag, String aux) {
    this.tag = tag;
    this.aux = aux;
  }

  @Override
  public int compareTo(TagAndAux o) {
    if (tag.compareTo(o.tag) != 0)
      return tag.compareTo(o.tag);
    return aux.compareTo(o.aux);
  }
}

public class TagSort {
  private static String tagToString(Map<TagAndAux, List<String>> block) {
    StringBuilder sb = new StringBuilder();
    for (Entry<TagAndAux, List<String>> e : block.entrySet())
      for (String ee : e.getValue())
        if (e.getKey().aux.isEmpty())
          sb.append("<" + e.getKey().tag + ">" + ee + "</" + e.getKey().tag + ">\n");
        else
          sb.append("<" + e.getKey().tag + " " + e.getKey().aux + ">" + ee + "</" + e.getKey().tag + ">\n");
    block.clear();
    sb.append("\n");
    return sb.toString();
  }

  public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    Map<TagAndAux, List<String>> block = new TreeMap<TagAndAux, List<String>>();
    StringBuilder sb = new StringBuilder();
    Pattern re = Pattern.compile("^<(.+?)(?: (.+?))?>(.+?)</\\1>$");
    while (in.hasNext()) {
      String line = in.nextLine();
      if (line.isEmpty()) {
        sb.append(tagToString(block));
      } else {
        Matcher m = re.matcher(line);
        if (m.find()) {
          Tag t = null;
          for (Tag e : Tag.values())
            if (e.toString().equals(m.group(1))) {
              t = e;
              break;
            }
          String aux = m.group(2);
          if (aux == null)
            aux = "";
          TagAndAux ta = new TagAndAux(t, aux);
          if (block.get(ta) == null)
            block.put(ta, new ArrayList<String>());
          block.get(ta).add(m.group(3));
        }
      }
    }
    in.close();
    if (!block.isEmpty()) {
      sb.append(tagToString(block));
    }
    System.out.print(sb);
  }
}