Are the characters ASCII characters or UNICODE?
"Each character of the string will be a small alphabet(ie. ‘a’ to ‘z’). " Hope it clears your doubt 
Not really, this doesn’t really say if they are ascii or unicode for example a in unicode is 64 but in ascii it’s 97
As far as I know it’s ASCII .
As far as I know, first 126 characters are the same in all charsets…