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.

Example Input: This stage is known as 'twisting the strands', and again, the twist can be left- or right-handed.
Example Output: This stage

Example Input: St. Helena and India.
Example Output: St. Helena and India.

Example Input: Hemp is very much softer than the other fibres described above.
Example Output:
Hemp