#include <iostream>
#include <map>
#include <string>
using namespace std;

struct Yoba {
	static void a() { std::cout << "!";}
};

std::map<std::string, decltype(&Yoba::a)> themap;

int main() {
	themap["a"] = &Yoba::a;
	themap["a"]();
	// your code goes here
	return 0;
}