def _countFollowingZeros(l):
 if (len(l) == 0):
  return 0
 elif (l[0] != 0):
  return 0
 else:
  return (1 + _countFollowingZeros(l[1:]))

def _countFollowingZeros ( l ) : if ( len ( l ) == 0 ) : return 0 elif ( l [ 0 ] != 0 ) : return 0 else : return ( 1 + _countFollowingZeros ( l [ 1 : ] ) )
return nr .