#include <bits/stdc++.h>
using namespace std;

int main()
{
	int N;
	cin >> N;

	string s[7] = { "Red", "Orange", "Yellow", "Green", "Cyan", "Blue", "Violet"  };
	map<string, int> mp;
	for( int i = 0; i < 7; i++ ) {
		mp[s[i]] = i;
	}
	int a[7] = { 0 };
	int b[7] = { 0 };
	for( int i = 0; i < N; i++ ) {
		string A;
		cin >> A;
		a[ mp[A] ]++;
	}
	for( int i = 0; i < N - 1; i++ ) {
		string B;
		cin >> B;
		b[ mp[B] ]++;
	}

	for( int i = 0; i < 7; i++ ) {
		if( a[i] == b[i] ) continue;
		cout << s[i] << endl;
		break;
	}
}