//No.516 赤と青の風船


#include <bits/stdc++.h>
using namespace std;
namespace
{
int iB;
int iR;

void Chk( char *S )
{
	if( S[ 0 ] == 'B' ) iB++;
	if( S[ 0 ] == 'R' ) iR++;
}

}

int main()
{
char S[ 20 ];
char T[ 20 ];
char U[ 20 ];

	cin >> S;
	cin >> T;
	cin >> U;

	iB = 0;
	iR = 0;
	Chk( S );
	Chk( T );
	Chk( U );
	if( iB > iR )
		cout << "BLUE" << endl;
	else
		cout << "RED" << endl;

	return 0;
}