Fuckshitfuck

Fuckshitfuck is an esolang invented by User:None1.

Its goal is to create an iterating quine and a quine.

Commands

F prints fuck.

f prints Fuck.

s prints shit.

Example programs

Iterating quine

fuck

and:

Fuck

Quine

shit

Implementations

Python

k={'f':'Fuck','F':'fuck','s':'shit'}
for i in input():
    if i in k:
        print(k[i])