auto decltype bool throw try catch class constexpr new delete const_cast static_cast dynamic_cast reinterpret_cast explicit export friend mutable using namespace noexcept nullptr operator private protected public static_assert template typename this thread_local typeid virtual

auto bool true false char wchar_t int short long float double long double signed unsigned enum union struct class sizeof typeid typedef public protected private virtual override final operator const constexpr using namespace inline new delete this nullptr void friend template if else for while do switch case default break continue goto and or xor not bitand bitor return try catch throw noexcept static_cast const_cast dynamic_cast reinterpret_cast register explicit extern

#include

using namespace std;

int main(){

int a,b,c;

cout<<"Hello world!"<

return 0;

}