#include <iostream>
#include <exception>
#include <string>

int main()
{
  std::cout << std::stoi("123") << std::endl;
  try
  {
    std::cout << std::stoi("abc") << std::endl;
  }
  catch (std::exception& e)
  {
    std::cerr << e.what() << std::endl;
  }
  return 0;
}