You can use join method for all the items within the list except for the last one >>>> use slice notation
and then insert the '&'

No.

Is it necessary to create a dict with 26 keys, one for each letter?

Oh, I got it. Not as formal as I wish, but It's working.

I used .replace("&,","&") hehe

I have tryed to go back from string to list, and replace the element "&," to "&" , but it isn't so formal, I guess...

I'm getting something like: 'name1, name2 &, name3'.

This comma just after & is killing me!!! hehe :)

I'm using ', '.join() (python)

And how exactly you go from list to string?

Sorry am a beginner at coding.
Will take care from now.

Hello guys. I'm having troubles to do this Kata. I can see a way to solve this problem. I already have the unique letters in strings, and the output for only non-alpha characters, but I can't see how to make an output like '1a2b3c...'

Can anyone help me?

I'm not an expert in programming, but I usually choose sugestive names for my variables. When I saw your code, I read 'w','f' and 'g' and I had no idea what was the meaning of these vars. You can maybe use 'w' and 'f' as 'firstStr' and 'secondStr', and 'g' as 'output', fox example.

I am programming in Python, and I got an error in 7th test, with $50 bill.

I am getting the input $50 bill and checking if I have at least one $25 bill to give a change.
If true, I increase the $50 bill amount and decrease the $25 bill amount. Then, I check if 'i' is equal to bill's array length.

Else, if I don't have any $25 bill, I'm returning 'NO'.