/in/foo.c: In function 'main':
/in/foo.c:6:2: 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:11:15: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(s[i]>='a'&&s[i]<='z'-k||s[i]>='A'&&s[i]<='Z'-k)
      ~~~~~~~~~^~~~~~~~~~~~~
/in/foo.c:13:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   else if(s[i]>'z'-k&&s[i]<='z'||s[i]>'Z'-k&&s[i]<='Z')
           ~~~~~~~~~~^~~~~~~~~~~
/in/foo.c:4:17: warning: unused variable 'len' [-Wunused-variable]
  int i,j,k,n,si,len;
                 ^~~
/in/foo.c:4:14: warning: unused variable 'si' [-Wunused-variable]
  int i,j,k,n,si,len;
              ^~
/in/foo.c:4:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,k,n,si,len;
        ^
/tmp/cckYbUy2.o: In function `main':
foo.c:(.text.startup+0x15): warning: the `gets' function is dangerous and should not be used.