Main.cc: In function ‘int main()’:
Main.cc:7:15: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
    7 |  for(int i=0;i<a.size();i++)
      |              ~^~~~~~~~~
Main.cc:13:3: error: ‘esle’ was not declared in this scope
   13 |   esle
      |   ^~~~