/in/foo.cc: In function 'int main()':
/in/foo.cc:20:13: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
   20 |         gets(a);
      |         ~~~~^~~
In file included from /usr/include/c++/12/cstdio:42,
                 from /usr/include/c++/12/ext/string_conversions.h:43,
                 from /usr/include/c++/12/bits/basic_string.h:3960,
                 from /usr/include/c++/12/string:53,
                 from /usr/include/c++/12/bits/locale_classes.h:40,
                 from /usr/include/c++/12/bits/ios_base.h:41,
                 from /usr/include/c++/12/ios:42,
                 from /usr/include/c++/12/ostream:38,
                 from /usr/include/c++/12/iostream:39,
                 from /in/foo.cc:1:
/usr/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
/usr/bin/ld: /tmp/ccf84iTB.o: in function `main':
foo.cc:(.text.startup+0xf): warning: the `gets' function is dangerous and should not be used.