using System.Linq;
using System;

public class Hello
{
    static void Main()
    {
        Console.ReadLine();
        string[] line = Console.ReadLine().Trim().Split(' ');
        string[] line2 = Console.ReadLine().Trim().Split(' ');
        var coL = new string[] { "Red", "Orange", "Yellow", "Green", "Cyan", "Blue", "Violet" };
        foreach (var x in coL)
        {
            if (line.Count(y => y == x) != line2.Count(y => y == x))
            { Console.WriteLine(x); return; }
        }
    }
}