You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
In this task, you need to count the number of words in a sentence that contain the given letter

Sentence: 'two gray birds standing in a green field'. How many words contain the letter 'a' in the sentence.
Solution: 3
Why? The words 'gray', 'standing', and 'a' contain the letter 'a'. So, the answer is 3.

New input: Sentence: 'a person sitting underneath an overpass in the sun'. How many words contain the letter 'e' in the sentence.
Solution:
4