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

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

    map<string, int> A, B;
    rep(i, 0, N){
        string a;
        cin >> a;
        A[a]++;
    }
    rep(i, 0, N-1){
        string b;
        cin >> b;
        B[b]++;
    }

    vector<string> color = {"Red", "Orange", "Yellow", "Green", "Cyan", "Blue", "Violet"};
    for(string &c : color){
        if(A[c] != B[c]){
            cout << c << endl;
            return 0;
        }
    }
}