The algorithm passed by using both Java and Javascript, but why this code won't pass for the test case:

"a", "a"

It will return -1, instead of 0.

I guess there might be some grammar mistake, can some one point it out?

Thanks!!

```
class Solution:
# @param {string} haystack
# @param {string} needle
# @return {integer}
def strStr(self, haystack, needle):
if len(haystack) < len(needle):
return -1
if (len(haystack) == 0) or (len(needle) == 0):
return 0
i = 0
j = 0
for i in range(len(haystack)-len(needle)+1):
for j in range(len(needle)):
if haystack[i+j] != needle[j]:
break
if j == len(needle):
return i
return -1
```