(n)
return result
:type n: int
    :rtype: List[str]
:type n: int
    :rtype: List[str]
: type n : int : rtype : List [ str ]
def gen_strobogrammatic(n):
    """
    :type n: int
    :rtype: List[str]
    """
    result = helper(n, n)
    return result
def gen_strobogrammatic ( n ) : result = helper ( n , n ) return result