<?php
$S1 = trim(fgets(STDIN));
$S2 = trim(fgets(STDIN));
$S3 = trim(fgets(STDIN));
$red = 0;
$blue = 0;

for ($i = 1; $i <= 3; $i ++) {
  if(${'S'.$i} === 'RED') {
    $red ++;
  } else {
    $blue ++;
  }
}

if ($red > $blue) {
  printf('RED');
} else {
  printf('BLUE');
}