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Solution.java

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import java.util.*;

import java.util.regex.*;

public class Solution {

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

int n = scan.nextInt();

String regex = "(\\w+)(| ).*>.*";

Pattern pattern = Pattern.compile(regex);

ArrayList<String> tags = new ArrayList<String>();

// Jump to the next line.

scan.nextLine();

for (int i = 0; i < n; i++) {

String line = scan.nextLine();

String[] allTags = line.split("<");

for (int j = 0; j < allTags.length; j++) {

if (allTags[j].matches(regex) == true) {

Matcher match = pattern.matcher(allTags[j]);

match.matches();

if (tags.contains(match.group(1)) == false)

tags.add(match.group(1));

}

}

}

Collections.sort(tags);

for (int k = 0; k < tags.size(); k++) {

if (k == tags.size() - 1)

System.out.println(tags.get(k));

else

System.out.print(tags.get(k) + ";");

}

scan.close();

}

}