#include <iostream>
using namespace std;

void swap(int& a, int& b) {
	int temp = a;
	a = b;
	b = temp;
}

int main() {
	int x = 1;
	int y = 5;
	cout << x << "\t" << y << endl;
	swap(x,y);
	cout << x << "\t" << y << endl;
}