import java.io.*;

public class Replace
{
	private static BufferedReader console = new BufferedReader( new InputStreamReader( System.in ) );

	public static String processLine(String line)
	{

		String newLine = "";
		String word = "";
		char ch;

		for(int i = 0; i < line.length(); i++)
		{
			// ch is the current character
			ch = line.charAt(i);

			// if ch is a letter, append it to the word
			// being constructed
			if(Character.isLetter(ch))
				word = word + ch;
			// otherwise, if ch is not a letter
			// and there is a word to output
			else if(word.length() != 0)
			{
				if(word.equals("red"))
					word = "blue";

				newLine = newLine + word;
				word = "";
				newLine = newLine + ch;
			}
			// otherwise, if ch is not a letter
			// and there is no word to output
			else
				newLine = newLine + ch;
		}
		
		if(word.length() != 0)
		{
			if(word.equals("red"))
                                        word = "blue";
                        newLine = newLine.concat(word);
		}

		return newLine;
	
	}

	public static void main(String [] args)
	{
                try
                {
			System.out.println("Please type the name of a file you want processed.");
			String filename = console.readLine();

                        FileReader fr = new FileReader(filename);
                        BufferedReader stdin = new BufferedReader(fr);

			FileOutputStream outFile;
			outFile = new FileOutputStream(filename+".out"); 
			PrintStream p = new PrintStream(outFile);

                        String line = "";
                        line = stdin.readLine();
			while(line != null)
			{
				String newLine = processLine(line);
				p.println(newLine);
                        	line = stdin.readLine();
			}

			p.close();
                }
                catch(java.io.IOException e)
                {
                        System.out.println(e);
                }

	}

}