Unencrypter

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

public class Unencrypter {

    public static void main(String[] args) throws IOException
    {
        File myFile = new File("output.txt");
        Scanner input = new Scanner(myFile);
        PrintWriter writer =  new PrintWriter("unencrypted.txt");
        while (input.hasNext())
        {
            String line = input.nextLine();
            char[] unencrypt = line.toCharArray();
            for (int i = 0; i < unencrypt.length; i++)
            {
                unencrypt[i] -= 10;
                writer.print(unencrypt[i]);
            }
            writer.println();
        }
        writer.close();
    }

}