Outputting contents with cat, can't tell what I'm doing wrong


I'm currently on the sixth exercise of redirection for learning command lines, and the final part of the exercise is having me output the contents of a file called islands.txt using the cat command.
I put cat < islands.txt into the terminal, and it outputs the contents just fine, but it's still labelled incorrect. Is there some sort of syntax I'm forgetting?


have you tried it with

cat islands.txt


That worked, thank you. Do you think you could tell me why my original command wasn't accepted, though? Both ways elicit the same output


here a link with unix command description

= http://discuss.codecademy.com/t/command-prompt/11817/2?u=leonhard_wettengmx_n