#include <iostream>
#include <fstream>
#include <string>

using namespace std;

string intersect( string, string );
string union( string, string );
string makeset( string );

int main()
{

	ifstream infile;
	ofstream outfile;
	string set1,set2,set3,temp,op;

	infile.open("SETS.IN");
	outfile.open("SETS.OUT");

	infile >> set1 >> set2 >> op;
	while( infile )
	{
		switch(op[0])
		{
			case '*': set3 = intersect( set1,set2 );
					break;
			case '+': set3 = union( set1,set2 );
					break;
		}
		
		set1 = makeset( set1 );
		set2 = makeset( set2 );
		set3 = makeset( set3 );

		outfile << set1 << " " << set2 << " = " << set3 << endl;
		
		infile >> set1 >> set2 >> op;
	}

	outfile.close();
	infile,close();
	return 0;
}


string intersect( string set1, string set2 )
{
	string set3;
	
	for( int loop = 0; loop < set1.length(); loop++ )
	{
		for( int loop2 = 0; loop2 < set2.length(); loop2++ )
			if( set1[loop] = set2[loop + loop2] )
				set3 += set1[loop];
	}
	
	return set3;
}
string union( string set1, string set2 )
{
	for( int loop = 0; loop < set2.length(); loop++ )
        {
                for( int loop2 = 0; loop2 < set1.length(); loop2++ )
                        if( set2[loop] !=  set1[loop + loop2] )
                                set1 += set2[loop];
        }

	return set3;
}

string makeset( string set )
{
	return set;
}