string indexing:-using idle

 Python 3.9.1 (tags/v3.9.1:1e5d33e, Dec  7 2020, 17:08:21) [MSC v.1927 64 bit (AMD64)] on win32

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>>> string="believer"

>>> first_string[0]

Traceback (most recent call last):

  File "<pyshell#1>", line 1, in <module>

    first_string[0]

NameError: name 'first_string' is not defined

>>> first_string="believer"

>>> first_string[0]

'b'

>>> first string[-1]

SyntaxError: invalid syntax

>>> first_string[-1]

'r'

>>> 

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