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

int main(void){
  int i;
  char S[10];
  int n1 = 0, n2 = 0;
  for(i = 0; i < 3; i++){
    scanf("%s", S);
    if(strcmp(S, "RED") == 0) n1++;
    else if(strcmp(S, "BLUE") == 0) n2++;
  }
  if(n1 > n2) printf("RED\n");
  else printf("BLUE\n");
  return 0;
}