/in/foo.c:1:1: warning: data definition has no type or storage class
 y=int(input())
 ^
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'y' [-Wimplicit-int]
/in/foo.c:1:3: error: expected expression before 'int'
 y=int(input())
   ^~~
/in/foo.c:3:11: warning: multi-character character constant [-Wmultichar]
     print('yes')
           ^~~~~
/in/foo.c:5:11: warning: multi-character character constant [-Wmultichar]
     print('no')
           ^~~~