In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.

Input: Consider Input: Sentence: There are four classes of biochemical compounds. Question: How many classes of biochemical compounds are there?

Output: four


Input: Consider Input: Sentence: A neutron collides with an atom of u-235 during the basic nuclear fission process. Question: What type of particle collides with an atom of u-235 during the basic nuclear fission process?

Output: a neutron


Input: Consider Input: Sentence: Rock stata is stacked in layers in "layer cake geology". Question: What is stacked in layers in "layer cake geology"?


Output: rock stata