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 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.

Ex Output:
the different types of cordage


Ex Input:
Left-handed ropes, in which each component is made in exactly the opposite direction, are found in commercial practice; but the only left-handed cordage supplied to the Royal Navy - and that in very small quantities - is hammock Iashing and marline.

Ex Output:
Left-handed ropes


Ex Input:
Four-stranded (rot-proofed manila or sisal) rope, laid up round a heart or centre made of the same material, is known as shroud-laid rope.

Ex Output:

Four-stranded (rot-proofed manila or sisal) rope