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I’m surprised to see so many people bruteforcing this one.
All there is to do to find the keyword CHIEF is to look at the deltas between the chars in the length 5 words. When the right one is found, that automatically gives you the shift.
Bruteforcing is just too easy for this problem.
Best of all it does not time-out. A bruteforce code can be shorter and tidier than other cleverer algorithms. People like to see shorter codes. Longer but faster codes are hidden by the recently introduced voting system.