import java.util.ArrayList;

public class shitty project extends Reducer<Text, Text, Text, Text> {

	private Text friendList = new Text();

    @Override
    public void reduce(final Text key, final Iterable<Text> values, final Context context) throws IOException, InterruptedException {

		ArrayList commonFriends = new ArrayList();

		if(values.size()!=2) System.out.println("Error");
		else{
		StringTokenizer list1 = new StringTokenizer(values[0].toString());
		StringTokenizer list2 = new StringTokenizer(values[1].toString());
    	 while (list1.hasMoreTokens()) {
			friend1=list1.nextToken();
			while (list2.hasMoreTokens()) {
			 friend2=list2.nextToken();
			 if(friend1==friend2) commonFriends(friend1);
    	 	}
    	 }
		}
        Collection<String> allValues= commonFriends.values();
        java.lang.String entireText = StringUtils.join(allValues, ',');

        friendList.set(entireText);
        context.write(key, friendList);
    }
}