#include <iostream>
using namespace std; 
class swap
{public:
int a,b;    
void swp();
void display ();
};
void swap::swp()
{ a=7,b=5;}
void swap::display()
    {
        a=a+b;
    b=a-b;
    a=a-b;
    }

int main() {
	// your code goes her
	swap obj;
	obj.swp();
	obj.display(); 
	
	return 0;
}