Question 15 solutions not producing the correct output

[hudnutt]

Describe the bug
Question 15 solutions not producing the correct output (except for the Python 2 solution which is correct)

To Reproduce
Paste the solutions in your editor of choice and run the code

Expected behavior
For input '9' I expected a result of 11106

Screenshots
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Desktop (please complete the following information):
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Smartphone (please complete the following information):
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Additional context

The Python 2 solution is correct

The first Python 3 solution does not run and returns error:
tmp+=a # concatenating 'a' to 'tmp'
TypeError: can only concatenate str (not "int") to str

The second Python 3 solution returns 90 instead of 11106

The solution by ChichiLovesDonkeys does not have a print statement. Even with that it outputs 90 instead of 11106.

The solution by lcastrooliveira returns 90 instead of 11106

The solution by apenam7 returns 90 instead of 11106

I think in all these instances not casting the user input digit to a string is the source of the problem. The solution I devised gives the correct answer of 11106.

a = input("Enter a digit ")
print(sum([int(str(a) * i) for i in range(1,5)]))