#include <stdio.h>

int main(){
	unsigned red = 0, blue = 0;
	if(getchar() == 'R'){
		red++;
		getchar();
		getchar();
		getchar();
	}else{
		blue++;
		getchar();
		getchar();
		getchar();
		getchar();
	}
	if(getchar() == 'R'){
		red++;
		getchar();
		getchar();
		getchar();
	}else{
		blue++;
		getchar();
		getchar();
		getchar();
		getchar();
	}
	if(getchar() == 'R'){
		red++;
		getchar();
		getchar();
		getchar();
	}else{
		blue++;
		getchar();
		getchar();
		getchar();
		getchar();
	}
	if(red > blue) puts("RED\n");
	else puts("BLUE\n");
	return 0;
}