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:
It should therefore be examined frequently for signs of deterioration.

Ex Output:
It


Ex Input:
Handling of man-made fibre cordage.

Ex Output:
man-made fibre cordage


Ex Input:
Weights and breaking strengths can be taken as being the same as those of cordage of similar size, material and normal lay.

Ex Output:

Weights and breaking strengths


