Codechef Copy

You want to create an Online Judge like Codechef - in fact, you decide to just copy Codechef as a whole! Just like Codechef, you give your judge a name of length $8$, given by the string $S$. However, you're worried that people will find out that your judge is a copy — in particular, you think that if $S$ and the string `"codechef"` have the same character at some position, people will find out