#include <stdio.h>
int main(){
    //input
    char S1[5];
    char S2[5];
    char S3[5];
    scanf("%s",S1);
    scanf("%s",S2);
    scanf("%s",S3);

    //count
    int red = 0;
    if (S1[0] == 'R') red++;
    if (S2[0] == 'R') red++;
    if (S3[0] == 'R') red++;

    //output
    if (red >= 2){
        printf("RED\n");
    }else{
        printf("BLUE\n");
    }
    return 0;
}