foo.cc: In function 'int main()':
foo.cc:8:11: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |  for(i=0;i<s.size()-1;i++)
      |          ~^~~~~~~~~~~
foo.cc:10:14: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   10 |   if(s[i]>=65&&s[i]<=90||s[i]>=97&&s[i]<=122)

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