text: #include <iostream>
  
  int main() {
    unsigned u = 10;
    unsigned u2 = 42;
    std::cout << u2 - u << std::endl;
    std::cout << u - u2 << std::endl;
  
    int i = 10;
    int i2 = 42;
    std::cout << i2 - i << std::endl;
    std::cout << i - i2 << std::endl;
    std::cout << i - u << std::endl;
    std::cout << u - i << std::endl;
    return 0;
  }
  