/in/foo.c:1:1: warning: data definition has no type or storage class
    1 | side=int(input())
      | ^~~~
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'side' [-Wimplicit-int]
/in/foo.c:1:6: error: expected expression before 'int'
    1 | side=int(input())
      |      ^~~