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

int main(void)
{
  char str[3][5];
  int i, data[2] = {0};

  scanf("%s%s%s", str[0], str[1], str[2]);


  for(i = 0; i < 3; i++){
    if(strcmp(str[i], "BLUE") == 0){
      data[0] += 1;
    }else if(strcmp(str[i], "RED") == 0){
      data[1] += 1;
    }
  }
  
  if(data[0] > data[1]){
    printf("BLUE\n");
  }else{
    printf("RED\n");
  }

  return 0;
}