import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 入力
		int a = sc.nextInt();
		String b = sc.nextString();
	  if (a < 3200){
	    Systemout.println("red");
	  } else{
	    Systemout.println("b");
	  }
	}
}