Explain this error message?

Question

user_input = input(": ")

This line shows error in sololearn code editor
That was,
EOFerror: EOF when reading a line

Answer 1

The error is not in the code. It occured because the input was not given perfectly.
You just need to understand the way Sololearn takes inputs.
Here's a short tutorial:
https://code.sololearn.com/WhiNb9BkJUVC/?ref=app