/in/foo.c:2:1: warning: data definition has no type or storage class
    2 | r=int(input())
      | ^
/in/foo.c:2:1: warning: type defaults to 'int' in declaration of 'r' [-Wimplicit-int]
/in/foo.c:2:3: error: expected expression before 'int'
    2 | r=int(input())
      |   ^~~