#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//INSERT ABOVE HERE
signed main(){
  string s1,s2,s3;
  cin>>s1>>s2>>s3;
  Int r=(s1=="RED")+(s2=="RED")+(s3=="RED");
  Int b=(s1=="BLUE")+(s2=="BLUE")+(s3=="BLUE");
  cout<<(r>b?"RED":"BLUE")<<endl;
  return 0;
}