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: Furthermore, cable-laid rope, being more solid in construction, is more resistant to chafe and does not absorb water so readily as hawser-laid rope.
Example Output: cable-laid rope

Example Input: General characteristics.
Example Output: General characteristics.

Example Input: To assist in distinguishing the different types of cordage a coloured jute yarn known as a rogue's yarn is woven into the strands of each type of rope manufactured at the Admiralty Ropery.
Example Output:
the different types of cordage