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.

Q: All three should be spread about one-third of the boat's length apart.

A: All three
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Q: It is impervious to saIt water, and so it is very suitable for slings, falls, berthing hawsers and tow- ropes.

A: It
****
Q: This rope is made from the leaves of the Agave sisalana plant, which is a member of the cactus family.

A:
This rope
****