In this task, you need to count the number of words in a sentence that contain the given letter

Example input: Sentence: 'two gray birds standing in a green field'. How many words contain the letter 'a' in the sentence.
Example output: 3
Example explanation: The words 'gray', 'standing', and 'a' contain the letter 'a'. So, the answer is 3.
Q: Sentence: 'a snowcovered bench with a tree and house in the background'. How many words contain the letter 'g' in the sentence.
A:
1