#include <iostream>
using namespace std;

#define A
#define B

int main() {
	#ifdef A
	std::cout << "a ";
	#endif
	
	#ifdef B
	std::cout << "b ";
	#endif
	
	#ifdef C
	std::cout << "c ";
	#endif
	
	#ifdef B C
	std::cout << "bc ";
	#endif
	
	#ifdef C B
	std::cout << "cb ";
	#endif
	
	return 0;
}