3. Digits

Prompt the user, enter a number in the range [1000, 9999].

If input failure, complain and die

If outside the range, complain and die

Output the square of the number, and the sum of the squares of the digits, with explanatory text.

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An example run might go as:

# in [1000, 9999]:

1234

square is 1522756

sum of squares of digits is 30