#include <iostream>
using namespace std;

#define trace(...) #__VA_ARGS__

int main() {
	
	int a = 1, b = 2, c = 3;
	string z;
	z = trace(a);
	cout << z << endl;
	
	z = trace(a, b);
	cout << z << endl;
	
	z = trace(a, b, c);
	cout << z << endl;
	
	return 0;
}