/*
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 * and open the template in the editor.
 */
package javaapplication1;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

/**
 *
 * @author a
 */
public class JavaApplication1 {

    /**
     * @param args the command line arguments
     */
    final static int BS=2048;
    static char[] cbuf=new char[BS];

    public static void main(String[] args) throws FileNotFoundException, IOException {

        String s="in.txt";


        File f=new File(s);
        long size=f.length();
        long total=0;

        FileWriter o= new FileWriter("out.txt");
        BufferedReader b=new BufferedReader(new FileReader(s));
        String last="";
        do {
            int len=b.read(cbuf, 0, BS);
            String str=new String(cbuf).substring(0, len).toLowerCase();
            total+=len;
            do {
                str=str.replaceAll("bug", "");
            } while (str.contains("bug"));
            System.out.print(str);
            o.write(str);
            o.flush();
        } while (total<size);
        o.close();

        System.out.print("end");


    }
}