import java.util.HashMap;
import java.util.Map;

public class Task101125 {
    public static void main(String[] args) {
        Map<Integer, String> map = new HashMap<>();
        map.put(1, "one");
        map.put(2, "two");
        map.put(3, "three");
        
        String result1 = map.remove(2);
        String result2 = map.remove(4);
        boolean result3 = map.remove(1, "two");
        boolean result4 = map.remove(3, "three");
        
        System.out.println(result1);
        System.out.println(result2);
        System.out.println(result3);
        System.out.println(result4);
    }
}