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.

The ropes supplied to the Royal Navy are made from various kinds of vegetable fibre which may differ in strength, weight, flexibility, hardness or resistance to wear, elasticity, resistance to weather, or behaviour when wet.
Output:
The ropes