import java.util.*;

/**
 *
 * @author
 */
public class WordList extends ArrayList<String> {

	/**
	 * method to returns the number of words in this WordList that are exactly len
	 * letters long
	 *
	 * @param len
	 *            - length of the words to search for
	 * @return number of words in this list of length len
	 */
	public int numWordsOfLength(int len)
   	{
		// to be implemented in part (a)
   		int count = 0;
       	for(int i = 0; i < this.size(); i++){
       		if(this.get(i).length() == len){
       			count++;
       		}
       	}
       	return count;
   	}

	/**
	 * All words that are exactly len letters long are removed from this WordList,
	 * with the order of the remaining words unchanged
	 *
	 * @param len
	 *            - length of the word to remove
	 */
	public void removeWordsOfLength(int len) {
		// to be implemented in part (b)

       	for(int i = 0; i < this.size(); i++){
       		if(this.get(i).length() == len){
       			remove(i);
       			i--;
       		}
       	}

	}

	/**
	 * method to calculate the length of the longest word
	 *
	 * @return length of the longest word
	 */
	public int lengthOfLongestWord() {
		// to be implemented in part (c)
		String largestword = "";
       	for(int i = 0; i < this.size(); i++){
       		if(this.get(i).length() == largestword.length()){
       			largestword = this.get(i);
       		}
       	}
		return largestword.length();
	}
}