#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);

    string a,b,c; cin >> a >> b >> c;
    map<string,int> mp;
    mp[a]++; mp[b]++; mp[c]++;
    if(mp["RED"] > mp["BLUE"]) cout << "RED" << endl;
    else cout << "BLUE" << endl;
}