foo.cc: In function 'int main()':
foo.cc:12:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |   for(int i=0; i<a.size(); i++)
      |                ~^~~~~~~~~
foo.cc:14:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |    if(i+1<a.size()&&a[i+1]<='9'&&a[i+1]>='0')
      |       ~~~^~~~~~~~~

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