/in/foo.c: In function 'main':
/in/foo.c:7:2: 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:12:15: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(s[i]>='A'&&s[i]<=('Z'-k)||s[i]>='a'&&s[i]<=('z'-k))
      ~~~~~~~~~^~~~~~~~~~~~~~~
/in/foo.c:14:23: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   else if(s[i]>('Z'-k)&&s[i]<='Z'||s[i]>('z'-k)&&s[i]<='z')
           ~~~~~~~~~~~~^~~~~~~~~~~
/tmp/ccCjrF1G.o: In function `main':
foo.c:(.text.startup+0x11): warning: the `gets' function is dangerous and should not be used.