// IMPORT LIBRARY PACKAGES NEEDED BY YOUR PROGRAM
// SOME CLASSES WITHIN A PACKAGE MAY BE RESTRICTED
// DEFINE ANY CLASS AND METHOD NEEDED
import java.util.List;
import java.util.Hashtable;

// CLASS BEGINS, THIS CLASS IS REQUIRED
public class Solution
{
    // METHOD SIGNATURE BEGINS, THIS METHOD IS REQUIRED
    List<String> retrieveMostFrequentlyUsedWords(String literatureText, List<String> wordsToExclude)
    {
        // Replace non-alphnum with space
        String st = literatureText.replaceAll("[^a-zA-Z]", " ");
        // Spilt by space
        String stArr []  = st.Spilt(" ");
        // iterate the array
        Hashtable<String, Integer> counts= new Hashtable<String, Integer>();
        for(int i = 0; i < stArr.size(); i++){
            String word = stArr[i];
            if(counts.get(word) != null){
                count.set(word, count.get(word)++);
            }else{
                count.set(word, 1);
            }
        }

    }
    // METHOD SIGNATURE ENDS
}