/in/foo.c:1:1: warning: data definition has no type or storage class
 a = int(input())
 ^
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
/in/foo.c:1:5: error: expected expression before 'int'
 a = int(input())
     ^~~
/in/foo.c:10:31: error: empty character constant
                 print(i,end = '')
                               ^~
/in/foo.c:13:32: error: empty character constant
                 print(',',end ='')
                                ^~
/in/foo.c:14:29: error: empty character constant
                 print(i,end='')
                             ^~