package com.javarush.task.task18.task1826;

/*
Шифровка
*/

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class Solution {
    public static void main(String[] args) {
        try {
            if (args[0].equals("-e")) {
                paramE(args);
            } else {
                paramD(args);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public static void paramE(String[] args) throws IOException {
        FileInputStream inputStream = new FileInputStream(args[1]);
        FileOutputStream outputStream = new FileOutputStream(args[2]);
        while (inputStream.available() > 0) {
            outputStream.write(inputStream.read() + 1);
        }
        inputStream.close();
        outputStream.close();


    }

    public static void paramD(String[] args) throws IOException {
        FileInputStream inputStream = new FileInputStream(args[1]);
        FileOutputStream outputStream = new FileOutputStream(args[2]);
        while (inputStream.available() > 0) {
            outputStream.write(inputStream.read() - 1);
        }
        inputStream.close();
        outputStream.close();
    }

}