($n,$m,$k)=glob<>;
if($n*2<$k||$m*2<$k||$n+$m<=$k){
	print -1;
	exit;
}
if($n*2==$k&&$n<$m){
	print "10"x$n,"1"x($m-$n);
	exit;
}
{
	$o=$k&&$k-1>>1;
	$p=$k+1&1;
	print "0"x($n-$p-$o),"10"x$o,"1"x($m-$o),"0"x$p;
}