/in/foo.c:1:1: warning: data definition has no type or storage class
 a=input().split(',')
 ^
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
/in/foo.c:1:3: warning: implicit declaration of function 'input' [-Wimplicit-function-declaration]
 a=input().split(',')
   ^~~~~
/in/foo.c:1:10: error: request for member 'split' in something not a structure or union
 a=input().split(',')
          ^
/in/foo.c:2:1: error: expected ',' or ';' before 'for'
 for b in range(0,4):
 ^~~