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

Ex Input:
Sentence: 'an untidy room with clothes bottles next to an oven'. How many words contain the letter 'a' in the sentence.

Ex Output:
2

Ex Input:
Sentence: 'trash cans and a fire hydrant are on the curb of a sidewalk'. How many words contain the letter 'u' in the sentence.

Ex Output:
1

Ex Input:
Sentence: 'a man throws a frisbee in the park'. How many words contain the letter 'b' in the sentence.

Ex Output:
1