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.

[EX Q]: This rope is made from the fibres of the stems of the hemp plant which is grown in many parts of the world, but notably in Italy, Russia, China, U.S.A., New Zealand, St.
[EX A]: This rope

[EX Q]: The rope is flexible, durable, strong, and stands up well to wear and weather.
[EX A]: The rope

[EX Q]: The length of a rope is measured in fathoms.
[EX A]:
The length of a rope