>>>>

>>>>RAT()
>>>>

>>>>It searches string from the right to left.
>>>>
>>>>>
>>>>>I thought right-to-left of AT() is RAT(), but I see it's not. Which function is of the right-to-left of AT()?
>>>
>>>Thank you All,
>>>
>>>I just tested with one character in a string and expected count from right to left. It was my mistake...
>>
>>len(b)-AT(a, b)
>
>
>len(b)-AT(a, b) + 1

Possibly. Depending on how he wanted to interpret the result.