#include <iostream>
using namespace std;

void change(int *p,int *q)
{
	int temp;
	temp = *p;
	*p = *q;
	*q = temp;
}
int main()
{
	int a = 3, b = 4;
	change(&a, &b);
	cout << a << endl << b << endl;
	return 0;
}