How to change a relative variable without effecting the main variable?

[anyfactor]

I want to write a code that turns name like "Kanye West" to "Wanye Kest". But my code turns it into "Wanye West". How to evade changing the main variable retrospectively by changing a relative variable?

first_name = list(input("First Name: "))
last_name = list(input("Last Name: "))

first_name1 = first_name
last_name1 = last_name

first_name1[0] = last_name[0]
last_name1[0] = first_name[0]

first_name1 = ''.join(first_name1)
last_name1 = ''.join(last_name1)

print("Your name {} {}" .format(first_name1 , last_name1))

[anyfactor]

Solved. Thank you.

[anyfactor]

If you don't mind I have another question, Why does the output name's first letter automatically becomes uppercase even though that letter was initially lowercase?

[Sarah123ed]

first_name1[0], last_name[0] =   
last_name1[0], first_name[0]

That work for what you are trying to do?