How can I figure out the gate's riddle?

Hint 1 of 8:

If you want to find the answer written down, see the previous question.
This question explains how you can solve the riddle without finding the
answer.

Hint 2 of 8:

The answer to each individual part of the riddle is very short.

Hint 3 of 8:

In fact, each part is only one letter.

Hint 4 of 8:

Take the four letters that are given in the clue and put them together.

Hint 5 of 8:

The first part's answer is "L."