import java.util.*;
public class Coin {
    private int c;
    private Random rand;
    private int h;
    private int t;
    private ArrayList<Integer> history;
    public Coin(){
       this.rand = new Random();
       history = new ArrayList<Integer>();
    }
    public String flip(){
        c = rand.nextInt(2);
        history.add(c);
        if(c==0){
            return "H";
        }
        else{
            return "T";
        }
    }
    public int getNumHeads(){
        for (int i = 0; i < history.size(); i++){
            if(history.get(i)==0){
                h = (h + 1);
            }
        }
        return h;
    }
    public int getNumTails(){
        for (int j = 0; j< history.size(); j++){
            if(history.get(j)==1){
                t = (t + 1);
            }
        }
        return t;
    }
   public void reset(){
       history.clear();
    }
}