Need help with string.gsub

Here is the problem. I’m trying to change a string like this Side[number] to just the number after it. Like this:

string.gsub("Side1", "Side", "")

The output
1 1
Why is this? Is there a way to fix it?

string.gsub returns two value. The first being the result while the second being the number of substitute.

Put a parenthesis around it if you only want the first value.

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Around what exactly? _________

The function call. For example (string.gsub("Side1", "Side", "")).

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