/in/foo.cc: In function 'int main()':
/in/foo.cc:6:3: error: 'cin' was not declared in this scope
   cin.get(a[i]);
   ^
/in/foo.cc:10:34: error: 'cout' was not declared in this scope
  for (int j = 0; j <= i - 3; j++)cout << a[j];
                                  ^