#include <bits/stdc++.h>
#define INF 990000000
//11
using namespace std;

int main() {
int re=0;
int bl=0;
string n;
for(int i=0;i<3;i++){
cin>>n;
if(n.compare("RED")==0)re++;
if(n.compare("BLUE")==0)bl++;

}

if(re-bl>0)
cout <<"RED"<<endl;
else
cout <<"BLUE"<<endl;




}