import javax.imageio.ImageIO;
public class Main {
static public void main(String args[]) throws Exception {
String names[] = ImageIO.getReaderFormatNames();
for (int i = 0; i < names.length; ++i) {
System.out.println("reader " + names[i]);
}
names = ImageIO.getWriterFormatNames();
for (int i = 0; i < names.length; ++i) {
System.out.println("writer " + names[i]);
}
}
}