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.

Input: Consider Input: When mature the abaca plant, which grows to a height of from 10 to 30 ft, is felled and the fibre from the leaf sheaths is stripped off.

Output: the abaca plant


Input: Consider Input: Rot-proofing was discontinued in 1963, because rot-proofed cordage has deteriorated in hot and humid conditions.

Output: Rot-proofing


Input: Consider Input: Rot-proofing was discontinued in 1963, because rot-proofed cordage has deteriorated in hot and humid conditions.


Output: Rot-proofing