Armstrong Number Checking
In number theory, an Armstrong number (after Michael F. Armstrong) or narcissistic number in a given number base (10 for this mission) is a number that is the sum of its own digits each raised to the power of the number of digits. For example, 153 is an Armstrong number because 13 + 53 + 33 == 153.
Input: Integer (int).
Output: Logic value (bool).
Examples:
assert...
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