#include <iostream>

void f() {
    std::cout << "  1" << std::endl;
    std::cout << "  2" << std::endl;
}

int main() {
    std::cout << "A" << std::endl;
    f();
    std::cout << "B" << std::endl;
    f();
    std::cout << "C" << std::endl;
}