list to list using python

Question

Here are two examples:
1. ['a', 'b', 'c', 'b', 'a'] expected result is ['a', 'b', 'c', 'b_1', 'a_1'].
2. ['z', 'z', 'z', 'z', 'z'] expected result is ['z', 'z_1', 'z_2', 'z_3', 'z_4'].

I have been trieng to solve it two days already/

Answer 1

Since you have been trying to solve it since two long days, try to get an idea from this code and implement it again on your own.
https://code.sololearn.com/c7Epn1z2dh6z

Answer 2

So, where is your code?

Answer 3

You can do it like this:
https://code.sololearn.com/cGapthz5b3D7/?ref=app

Answer 4

Show your source code.

Or make the question a little clearer.🙏

Answer 5

RKK, useful advice, i've done so, thanks a lot! I also done it in lambda function, but it less convenient way in this case.

https://code.sololearn.com/ctLlWrh8gkNd/?ref=app