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 is grown in Kenya, Tanganyika, Haiti and Java and, when new and untreated, is hairy and of a pale straw colour.

Ex Output:
It

Ex Input:
Next, a certain number of yarns are twisted together to form strands which, at the Admiralty Ropery, Chatham, are usually 150 fathoms in length when completed.

Ex Output:
a certain number of yarns

Ex Input:
When new and untreated it is deep golden-brown in colour.

Ex Output:
it