/* -*- coding: utf-8 -*-
 *
 * 1468.cc:  No.1468 Colourful Pastel - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 100000;
const int CN = 7;

const char scs[CN][16] = {
  "Red", "Orange", "Yellow", "Green", "Cyan", "Blue", "Violet"
};

/* typedef */

/* global variables */

int cmap[128];
int acs[CN], bcs[CN];

/* subroutines */

/* main */

int main() {
  for (int i = 0; i < CN; i++) cmap[scs[i][0]] = i;

  int n;
  scanf("%d", &n);

  for (int i = 0; i < n; i++) {
    char s[16];
    scanf("%s", s);
    acs[cmap[s[0]]]++;
  }
  for (int i = 0; i + 1 < n; i++) {
    char s[16];
    scanf("%s", s);
    bcs[cmap[s[0]]]++;
  }

  for (int i = 0; i < CN; i++)
    if (acs[i] != bcs[i]) {
      puts(scs[i]);
      break;
    }
  return 0;
}