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.

Example Input: The harder the twist given to the strands in laying, the shorter will be the resultant rope-in practice, three strands of I50fathoms lay up into a rope about 120 fathoms in length - and a rope is said to be hard-laid or soft-laid.
Example Output: the twist

Example Input: Next, a certain number of yarns are twisted together to form strands which, at the Admiralty Ropery, Chatham, are usually 150 fathoms in length when completed.
Example Output: a certain number of yarns

Example Input: Hemp is heavier than manila and the best quality is stronger than the manila supplied to the Royal Navy.
Example Output:
Hemp