%h=@h=(M,1000,CM,900,D,500,CD,400,C,100,XC,90,L,50,XL,40,X,10,IX,9,V,5,IV,4,I,1);
$r=join'|',sort{$b=~/../-$a=~/../}keys%h;
<>;
<>=~s/$r/$s+=$h{$&}/ger;
exit!print"ERROR"if$s>3999;
while($s){
	($_)=grep$h{$_}&&$s>=$h{$_},@h;
	print;
	$s-=$h{$_};
}