I finally understood your problem. The problem description needs some adjustment. It is not clear that it is requesting only the global variable named 'z'. I thought it was referring to every global variable.
The Goldbach Conjecture, Part 2
Find the palindrome
Is my wife right? Now with even more wrong husband
2 b | ~ 2 b
Sum the Infinite Series
Back to basics: throwing errors / exceptions
Code breaker, Part III: Operation Xiangliu
Guess the number I'm thinking of
Arrange the names in alphabetical order (2)
Code breaker, Part I: Operation Phoenix
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