You will be given a definition of a task first, then some input of the task.
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.

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.
Output:
cordage