import java.util.*;
import java.util.concurrent.CopyOnWriteArrayList;

public class Task161225 {
    public static void main(String[] args) {
        List<Integer> failFast = new ArrayList<>(Arrays.asList(1, 2, 3));
        List<Integer> failSafe = new CopyOnWriteArrayList<>(Arrays.asList(1, 2, 3));
        
        try {
            for (int num : failFast) {
                System.out.print(num + " ");
                if (num == 2) failFast.add(4);
            }
        } catch (Exception e) {
            System.out.print("FFex ");
        }
        
        try {
            for (int num : failSafe) {
                System.out.print(num + " ");
                if (num == 2) failSafe.add(4);
            }
        } catch (Exception e) {
            System.out.print("FSex ");
        }
        
        System.out.print(failFast.size() + " ");
        System.out.print(failSafe.size());
    }
}