Remove everything except first set os numbers

Hello,

I'm in need to rename a bunch files to only numbers, that the file contains.

Basically I have files with different lenghts (so I can't remove first and last chars), and I want to maintain the first set of numbers found by script.

For example

doNotTouchfile3_insideeverything-1.jpg - This should rename to 3.jpg
wet-undaunted-ud-25-aab-1.png - This should rename to 25.png
burned-tower-undaunted-ud-71-cdd-1.png - This should rename to 71

Please keep in mind that the set of numbers could be 157 (3 digits)

Can someone help me to achieve this?
Thanks!

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