Eww, those bytes are gross
Japt -P, score: 255 (2 bytes)

ff




f =&gt; filter, second f =&gt; everything but 'f'

Try it online!



Japt, score: 255 (2 bytes)

From @Shaggy

oo


o =&gt; remove everything but, second o =&gt; 'o'

Try it online!