<>;
@a=glob<>;
for$i(0..6){
	for$j(0..79){
		$a=0;
		for$k(0..99){
			$a+=$a[$j+$k*44100/(261.6,294.3,327.0,348.8,392.4,436.0,490.5)[$i]];
		}
		if($b<$a){
			$b=$a;
			$z=$i;
		}
	}
}
print+(C..G,A,B)[$z],4