package HackerRank; import java.util.*; class Student{} class Rockstar{ } class Hacker{} public class FiftyFive { static String count(ArrayList mylist){ int a = 0,b = 0,c = 0; for(int i = 0; i < mylist.size(); i++){ Object element=mylist.get(i); if (element instanceof Student) a++; if (element instanceof Rockstar) b++; if (element instanceof Hacker) c++; } String ret = Integer.toString(a)+" "+ Integer.toString(b)+" "+ Integer.toString(c); return ret; } public static void main(String []args){ ArrayList mylist = new ArrayList(); Scanner sc = new Scanner(System.in); int t = sc.nextInt(); for(int i=0; i