#include <stdio.h>
#include <string.h>

int main(){
    char husen[3][5];
    int i, cnt_B = 0, cnt_R = 0;;

    for(i = 0; i < 3; i++){
        scanf("%s\n", husen[i]);
        if(strcmp(husen[i], "RED") == 0){
            cnt_R++;
        }else if(strcmp(husen[i], "BLUE") == 0){
            cnt_B++;
        }
    }
    if(cnt_R > cnt_B){
        printf("RED\n");
    }else{
        printf("BLUE\n");
    }

    return 0;
}