#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=a;i<b;i++)
#define rep(i,b) FOR(i,0,b)
#define INF 1e9

using ll = long long;
const ll mod = LLONG_MAX;

typedef pair<int,int> P;


int main(){
  int r=0,b=0;
  string s;
  rep(i,3){
    cin>>s;
    if(s=="RED")r++;
    else b++;
  }
  if(r>b)cout<<"RED"<<endl;
  else cout<<"BLUE"<<endl;
}