#include<iostream>
#include<stdio.h>
#include<list>
#include<string>

const bool FIRST_STRING = true;
const bool SECOND_STRING= false;



template<typename CHAR = char>
class SFNDiff
{
protected:
	typedef CHAR Char;
	typedef std::basic_string<Char, std::char_traits<Char>, std::allocator<Char> > String;
	typedef std::list<String> Lstring;
	typedef typename Lstring::const_iterator LConstIterator;
	Lstring	m_text1;
	String m_originalText1;
	Lstring	m_text2;
	String m_originalText2;
protected:
	const Lstring &GetText(bool bFirstTextAsked) const
	{
		return bFirstTextAsked?m_text1:m_text2;
	}
	
	String ToString(bool bFirstTextAsked) const
	{
		const Lstring & text = GetText(bFirstTextAsked);
		LConstIterator it;
		String result;
		for(it = text.begin();it!=text.end();it++)
		{
			result << *it;
		}
		return result;
	}
	
	virtual bool IsSeparator(const Char &elem) const
	{
		return true;
	}
	virtual void StoreWord(const String& s,bool isWord1)
	{
		Lstring& result = isWord1?m_text1:m_text2;
		result.erase(result.begin(),result.end());
		String sWord;
		LConstIterator it = (LConstIterator) s.begin();
		while(it!=s.end())
		{
			if(!IsSeparator(*it))
				result.push_back(*it);
			it++;
		}
	}
	const String& GetString(bool bFirstWord) const
	{
		return bFirstWord?m_originalText1:m_originalText2;
	}
public:
	SFNDiff(String iw1,String iw2)
	{
		m_originalText1.assign(iw1.begin(),iw2.end());
		m_originalText2.assign(iw2.begin(),iw2.end());
		StoreWord(iw1,FIRST_STRING);
		StoreWord(iw2,SECOND_STRING);
	}
	String ToString()
	{
		String result;
/*		result << "{SFNDiff[";
		result << m_originalText1;
		result << ",";
		result << m_originalText2;
		result << "]=";
		result << ToString(FIRST_STRING);
		result << ",";
		result << ToString(SECOND_STRING);
		result << "}";*/
		return result;
	}
};



bool IsNbArgValid(int argc)
{
	return argc==3;
}

int main(int argc,char* argv[])
{
	if(IsNbArgValid(argc))
	{
		SFNDiff<char> diff(argv[1],argv[2]);
		std::cout << diff.ToString() << std::endl;
	}else
		std::cout << argv[0] << " is excpecting 2 arguments" << std::endl;
	return 0;
}