#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstdlib>
#include<vector>
#include<string>
#include<sstream>
#include<cmath>
#include<numeric>
#include<map>
#include<stack>
#include<queue>
using namespace std;


int main(void) {

  string s;
  int r = 0;
  for(int i=0; i<3; i++){
    cin >> s;
    if( s == "RED" ) r++;
  }
  cout << ( r >= 2 ? "RED" : "BLUE") << endl;

  return 0;
}






// EOF