/in/foo.c: In function 'main':
/in/foo.c:10:9: warning: 'gets' is deprecated [-Wdeprecated-declarations]
   10 |         gets(a);
      |         ^~~~
In file included from /in/foo.c:1:
/usr/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
/usr/bin/ld: /tmp/cc2vnQKE.o: in function `main':
foo.c:(.text.startup+0x14): warning: the `gets' function is dangerous and should not be used.