In this task, you are given a sentence. You must find the primary subject in the supplied sentence. The output must be a sub-sequence in the sentence.
One example: Rope and its Usage
Solution is here: Rope
Explanation: The word 'Rope' is the key subject here, while Usage is a property of Rope.

Now, solve this: All three should be spread about one-third of the boat's length apart.
Solution:
All three