// CS210 F'03 Exam 1
// Question 6
//

#include <iostream>
using namespace std;

int main(void)
{
  int green(2),
      grass(5),
      sunny(3),
      skies(7);

  if( green < grass && sunny > skies )
   cout << "Blue" << endl;
  else
   cout << "Yellow" << endl;

}

// output
// Yellow