#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using ull=unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

#define READ_A_CHAR getchar

int readInt(){
  int res=0;
  char c;
  while((c=READ_A_CHAR())!='\n') res=res*10+(c-'0');
  return res;
}
void readUntil(char c){ while(READ_A_CHAR()!=c); }

const char Colors[] = "ROYGCBV";
const char* Colors2[] = {"Red\n","Orange\n","Yellow\n","Green\n","Cyan\n","Blue\n","Violet\n"};
int getColorIdx(char c){ rep(t,7) if(Colors[t]==c) return t; }

int main(){
  int N=readInt();
  int C[7]={};
  rep(i,N-1) C[getColorIdx(READ_A_CHAR())]++, readUntil(' ');
  C[getColorIdx(READ_A_CHAR())]++, readUntil('\n');
  rep(i,N-2) C[getColorIdx(READ_A_CHAR())]--, readUntil(' ');
  C[getColorIdx(READ_A_CHAR())]--, readUntil('\n');
  rep(t,7) if(C[t]) printf(Colors2[t]);
  return 0;
}