Python: The immutability of primitive types

Imagine that we need to change a character in a string. This is what will come out of it:

first_name = 'Alexander'
first_name[0] = 'B'
# Error: TypeError: 'str' object does not support item assignment

This happens because of the immutability of primitive types in Python - the language does not give any physical possibility to change the string. The immutability of primitive types is important for many reasons. The key reason is performance.

But sometimes we need to change a string. That's what variables are for:

first_name = 'Alexander'
first_name = 'Blexander'
print(first_name)  # => Blexander

There is a big difference between changing the value of a variable and changing the value itself. You can't change primitive types in Python, but you can change composite types. You can also change the value of a variable without any problem.

Instructions

You are given three variables with the names of different people. Make and display a word of characters in this order:

1. The third character from the first line
2. The second character from the second line
3. The fourth character from the third line
4. The fifth character of the second line
5. The third character from the second line

Try using interpolation: not only whole variables can be placed inside curly brackets, but also individual characters using square brackets.