Google sheets, convert value from 1 column to another based on particular data in it

Let's say I have those values in the column:

w 1w 2w 3

I want to convert those values to

123

in another column.

So basically I need to convert the value "w x" to "x".
How do I do that?

Another example:Let's say I have these values in a column:

World Level 1 (AR 0-19)World Level 2 (AR 20-24)World Level 3 (AR 25-29)

I want the result to be

123