/in/foo.cc: In function 'int main()':
/in/foo.cc:8:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |         for(int i=1;i<=s.size();i++)
      |                     ~^~~~~~~~~~
/in/foo.cc:7:13: warning: 'l' may be used uninitialized [-Wmaybe-uninitialized]
    7 |         int l;
      |             ^