Hint 1:
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What does N \bmod 10 give you?
Try with numbers 45, 500.
Hint 2:
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It gives you the right-most digit in the decimal representation of the number.
Hint 3:
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What does N // 10 do?
Try with numbers 45, 500.
Hint 4:
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Chops off the right-most digit in the decimal representation of the number.
Hint 5:
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Now we have way to get current digit, and chop it off.
How long do we need to repeat this process?
Hint 6:
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Until we get the number 0.
Hint 7 (full solution):
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We can use a while loop to keep going until the current number is 0, and store the sum in another variable, where we add each digit.