import java.io.*;
import java.util.*;

public class Sync {
    static boolean flag = true;
    static final String[] cmd = new String[]{"DELETE ", "COPY "};

    public static void main(String[] args) {
        File first = new File(args[0]), second = new File(args[1]);
        delete(first, second, args);
        copy(second, first, args);
        if (flag) {
            System.out.println("IDENTICAL");
        }
    }

    public static void delete(File first, File second, String[] args){
        if (first.exists()) {
            ArrayList<String> list = new ArrayList<>(Arrays.asList(first.list()));
            File[] arr = second.listFiles();
            list.sort(Comparator.naturalOrder());
            Arrays.sort(arr, Comparator.comparing(x -> x.getName()));
            for (File f : arr) {
                if (f.isDirectory()) {
                    delete(new File(first, f.getName()), f, args);
                } else if (!list.contains(f.getName())) {
                    flag = false;
                    System.out.println("DELETE " + f.toString().substring(args[0].length() + 1));
                } else {
                    try {
                        File file = new File(first, f.getName());
                        byte[] bf = new byte[(int) f.length()], bd = new byte[(int) file.length()];
                        FileInputStream stream = new FileInputStream(f);
                        stream.read(bf);
                        stream.close();
                        stream = new FileInputStream(file);
                        stream.read(bd);
                        stream.close();
                        if (!Arrays.equals(bf, bd)) {
                            flag = false;
                            System.out.println("DELETE " + f.toString().substring(args[0].length() + 1));
                        }
                    } catch (IOException e) {
                    }
                }
            }
        } else {
            flag = false;
            File[] arr = second.listFiles();
            Arrays.sort(arr, Comparator.comparing(x -> x.getName()));
            for (File f : arr) {
                System.out.println("DELETE " + f.toString().substring(args[0].length() + 1));
            }
        }
    }

    public static void copy(File first, File second, String[] args){
        if (first.exists()) {
            ArrayList<String> list = new ArrayList<>(Arrays.asList(first.list()));
            File[] arr = second.listFiles();
            list.sort(Comparator.naturalOrder());
            Arrays.sort(arr, Comparator.comparing(x -> x.getName()));
            for (File f : arr) {
                if (f.isDirectory()) {
                    copy(new File(first, f.getName()), f, args);
                } else if (!list.contains(f.getName())) {
                    flag = false;
                    System.out.println("COPY " + f.toString().substring(args[1].length() + 1));
                } else {
                    try {
                        File file = new File(first, f.getName());
                        byte[] bf = new byte[(int) f.length()], bd = new byte[(int) file.length()];
                        FileInputStream stream = new FileInputStream(f);
                        stream.read(bf);
                        stream.close();
                        stream = new FileInputStream(file);
                        stream.read(bd);
                        stream.close();
                        if (!Arrays.equals(bf, bd)) {
                            flag = false;
                            System.out.println("COPY " + f.toString().substring(args[1].length() + 1));
                        }
                    } catch (IOException e) {
                    }
                }
            }
        } else {
            flag = false;
            File[] arr = second.listFiles();
            Arrays.sort(arr, Comparator.comparing(x -> x.getName()));
            for (File f : arr) {
                System.out.println("COPY " + f.toString().substring(args[0].length() + 1));
            }
        }
    }
}