Hello Freddy,
Right now to shifted you assigned index + shift, two numbers who equal 10.
But the question wants you to find the letter in alphabet at the location of index + shift instead.
For example, to get specifically the 6th letter out of a string you can use string_var[5]. Using this example, can you get the specific letter of index + shift out of the alphabet string?
Also, a hint you can always print shifted to see what is currently in the variable to help you debug the issue.