/in/foo.cc: In function 'std::__cxx11::string reads()':
/in/foo.cc:89:15: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  while (c>='a'&&c<='z'||c>='A'&&c<='Z') s+=c,c=getchar();
         ~~~~~~^~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:100:6: warning: unused variable 'k' [-Wunused-variable]
  int k=0;
      ^