$S=<>;
{
	$_=$S;
	s/h//g;
	y/e/h/;
	$x=1;
	$M=0;
	s{phn(h*om)+}{
		$t=(-2+length$&=~s/h//gr)/2;
		$x+=$t;
		$M=$t+1 if $t+1>$M
	}ge;
	$z=$x+$M;
}
{
	$_=$S;
	$x=0;
	$M=0;
	s{phn(h*om)+}{
		$t=(-2+length$&=~s/h//gr)/2;
		$x+=$t;
		$M=$t+1 if $t+1>$M
	}ge;
	$z=$x+$M if $x+$M>$z;
}
print$z,$/