Rating:

After calling nc misc.2020.chall.actf.co 20204 the server will respond with a barrage of :

clam{clam_clam_clam_clam_clam} malc{malc_malc_malc_malc_malc}

Removing them will leave us with :

type "clamclam" for salvation

Sending clamclam will return us with the flag