/in/foo.cc:8:1: error: 'll' does not name a type
 ll a,b;
 ^~
/in/foo.cc:9:10: error: '::main' must return 'int'
 int main(){
          ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:10:7: error: 'a' was not declared in this scope
  cin>>a>>b;
       ^
/in/foo.cc:10:10: error: 'b' was not declared in this scope
  cin>>a>>b;
          ^