#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e17;
constexpr int MOD = 1000000007;

int main(){
    int B = 0,R = 0;
    rep(i,3){
        string s;
        cin >> s;
        if(s=="RED") R++;
        else B++;
    }
    cout << (B<=R?"RED":"BLUE") << endl;
    return 0;
}