import java.io.*;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        String in = bufferedReader.readLine();
        String out = bufferedReader.readLine();
        reverseByByte(in, out);
    }

    private static void reverseByByte(String input, String output) {
        String pathOutput = output.equals("") ? input : output;
        try (RandomAccessFile rafInput = new RandomAccessFile(input, "rw");
             RandomAccessFile rafOutput = pathOutput.equals(input) ?
                     rafInput :
                     new RandomAccessFile(pathOutput, "rw")) {

            System.out.println("Имя входного файла: " + input + "\nИмя выходного файла:" + pathOutput + "\nТип разворота: побайтовый");

            if (rafInput == rafOutput)
                reverseByByteInTheSameFile(rafInput);
            else {
                reverseByByteInTheOtherFile(rafInput, rafOutput);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static void reverseByByteInTheSameFile(RandomAccessFile raf) throws IOException {
        byte temp1;
        byte temp2;
        for (int i = 0; i < raf.length() / 2; i++) {
            raf.seek(i);
            temp1 = raf.readByte();

            raf.seek(raf.length() - i - 1);
            temp2 = raf.readByte();

            raf.seek(raf.length() - i - 1);
            raf.writeByte(temp1);

            raf.seek(i);
            raf.writeByte(temp2);
        }
    }

    private static void reverseByByteInTheOtherFile(RandomAccessFile rafInput, RandomAccessFile rafOutput) throws IOException {
        byte temp;
        for (int i = (int) rafInput.length() - 1; i >= 0; i--) {
            rafInput.seek(i);
            temp = rafInput.readByte();
            rafOutput.writeByte(temp);
        }
    }
}