SSNHyphens.cpp

#include <string>

using namespace std;

string SSNHyphens(const string & aString)
{
	if(aString.length() < 9)
	   return aString;
	if(aString[3] == '-')
	   return aString;
	return aString.substr(0,3) + '-' +
	       aString.substr(3,2) + '-' +
	       aString.substr(5,4);
}