import java.io.*;
import java.nio.file.*;
import java.util.*;
import java.util.regex.*;
 
public class Main {
 
    public static void main(String[] args) throws IOException {
        Pattern ptn = Pattern.compile("^(.*?)(\\d+)(\\.[^.]*)?$");
        Files.list(Paths.get(""))
                .map(p -> ptn.matcher(p.getFileName().toString()))
                .filter(Matcher::matches)
                .forEach(m -> {
                    String r = m.group(1)
                            + String.format("%3s", m.group(2)).replace(' ', '0')
                            + Objects.toString(m.group(3), "");
                    new File(m.group(0)).renameTo(new File(r));
                });
    }
 
}

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