It looks like you’re using a sequence variable on the calculator, whereas in your code you have lowercase letters in Str8. It’s important to note that the blue u, v, and w variables printed on your calculator are not the same as the lowercase letters in Str8. In order to type the proper lowercase alpha letters on your calculator, you’ll need to run this as a separate program:
(or if you don’t have a CE, I think the token will just be AsmPrgm at the start)
Once you run that program, you’ll be able to hit the alpha key twice and then type the green letters in lowercase. Again, the blue letters won’t work because they are variables.