public class Solution {
    public static void main(String[] args) throws Exception {
        //напишите тут ваш код
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        float a = Float.parseFloat(bufferedReader.readLine());
        int t = (int) a;

        if (t > -1 && t < 61) {
            if (String.valueOf(t).endsWith("4") || String.valueOf(t).endsWith("9") && t != 0) {
                System.out.println("красный");
            } else if (String.valueOf(t).endsWith("3") || String.valueOf(t).endsWith("8")) {
                System.out.println("жёлтый");
            } else System.out.println("зелёный");
        }
    }

}