awk '
BEGIN{
	q='"\"'\""'; 
	o=""
}
{
	for(i=1;i<=NF;i++)
	{
		f=$i;fl=length($i)
		nf=$(i+1);nfl=length($(i+1))
		if (nfl==0) {o=o f}
		else if(fl>1) {o=o f" "} 
		else if ((fl==1) && (nfl>1)) {o=o f" "}
		else if ((f~/[[:lower:]]/) && (nf~/[[:upper:]]/ || nf~/[[:digit:]]/ || nf~/[\(]/) ) {o=o f" "} 
		else if ((f~/[[:lower:]]/) && (nf~/[[:digit:]]/ ) ) {o=o f" "} 
		else if ((f~/[[:digit:]]/) && (nf~/[[:alpha:]]/)) {o=o f" "}
		else if ((f~/[[:punct:]]/) && (f!~/[\(\-]/ && f!=q && nf!~/[[:punct:]]/)) {o=o f" "}
		else {o=o f}
	} 
	o=o RS
	printf "%s", o > output.txt
	o=""
}
END{

}' input.txt