/in/foo.c: In function 'main':
/in/foo.c:5:2: warning: 'gets' is deprecated [-Wdeprecated-declarations]
  gets(s);
  ^~~~
In file included from /in/foo.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.c:8:15: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  {if(s[i]>='a'&&s[i]<='z'-k||s[i]>='A'&&s[i]<='Z'-k)
      ~~~~~~~~~^~~~~~~~~~~~~
/in/foo.c:10:19: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
 else if(s[i]>'z'-k&&s[i]<='z'||s[i]>'Z'-k&&s[i]<='Z')
         ~~~~~~~~~~^~~~~~~~~~~
/tmp/ccx6X3OC.o: In function `main':
foo.c:(.text.startup+0x12): warning: the `gets' function is dangerous and should not be used.