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


[Q]: New and untreated hemp rope is hard, smooth, pale grey in colour and of a lighter shade than manila but darker than sisal.
[A]: New and untreated hemp rope


[Q]: In the Royal Navy cordage is described by reference to the circumference of the rope measured in inches and to the material from which it is made-for example, 4Â½-inch manila.
[A]:
cordage