Challenge
Implement positive_and_even(a) for an integer a. Return the exact string "satisfactory" if a is strictly positive and even. Otherwise return "unsatisfactory". Zero is not positive.
Target complexity: O(1)
Return values are checked by type. Use the exact function name. Print output is not your answer. Tests have time and memory limits.
Public examples
Example 1
Arguments
[3]
Expected return
unsatisfactory
Example 2
Arguments
[4]
Expected return
satisfactory
Hint
Match the return value and type to the contract.
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