```
class Solution(object):
def isStrobogrammatic(self, num):
"""
:type num: str
:rtype: bool
"""
i, j = 0, len(num) - 1
while i < j:
s = num[i] + num[j]
if s in ['69', '96', '88', '11', '00']:
i += 1
j -= 1
else:
return False
if i == j:
return True if num[i] in '018' else False
else:
return True
```