/in/foo.c: In function 'main':
/in/foo.c:10:2: warning: 'gets' is deprecated [-Wdeprecated-declarations]
  gets(a);
  ^~~~
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:8:13: warning: unused variable 'i' [-Wunused-variable]
  int i1,n,k,i;
             ^
/in/foo.c:8:11: warning: unused variable 'k' [-Wunused-variable]
  int i1,n,k,i;
           ^
/in/foo.c:8:9: warning: unused variable 'n' [-Wunused-variable]
  int i1,n,k,i;
         ^
/in/foo.c:8:6: warning: unused variable 'i1' [-Wunused-variable]
  int i1,n,k,i;
      ^~
/in/foo.c: In function 'Moveleft':
/in/foo.c:25:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/tmp/ccHC3lSA.o: In function `main':
foo.c:(.text.startup+0xc): warning: the `gets' function is dangerous and should not be used.