import java.io.File;
import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;

public class Sync {

	private static boolean identical;

	public static void main(String[] args) {
		File S = new File(args[0]), D = new File(args[1]);
		identical = true;
		sync(S, D, "DELETE ");
		sync(D, S, "COPY ");
		if (identical) {
			System.out.println("IDENTICAL");
		}
	}

	private static void sync(File s, File d, String command) {
		if (s.exists()) {
			ArrayList<String> sf = new ArrayList<>(Arrays.asList(s.list()));
			File[] files = d.listFiles();
			sf.sort(Comparator.naturalOrder());
			Arrays.sort(files, Comparator.comparing(File::getName));
			for (File f : files) {
				if (f.isDirectory()) {
					sync(new File(s, f.getName()), f, command);
				} else if (!sf.contains(f.getName())) {
					identical = false;
					System.out.println(command + f.toString().substring(2));
				} else if (new File(s, f.getName()).length() != f.length()) {
					try {
						File mFile = new File(s, f.getName());
						byte[] bf = new byte[(int) f.length()], bd = new byte[(int) mFile.length()];
						FileInputStream mFileInputStream = new FileInputStream(f);
						mFileInputStream.read(bf);
						mFileInputStream.close();
						mFileInputStream = new FileInputStream(mFile);
						mFileInputStream.read(bd);
						mFileInputStream.close();
						if (!Arrays.equals(bf, bd)) {
							identical = false;
							System.out.println(command + f.toString().substring(2));
						}
					} catch (Throwable t) {
					}
				}
			}
		} else {
			identical = false;
			File[] files = d.listFiles();
			Arrays.sort(files, Comparator.comparing(File::getName));
			for (File f : files) {
				System.out.println(command + f.toString().substring(2));
			}
		}
	}

}