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

Ex Input:
Sentence: 'a crowd of people walking around a city street'. How many words contain the letter 'p' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a black and white photo of a very crowded tropical beach'. How many words contain the letter 'p' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a small bird sitting on a large rock on a part of a mountain'. How many words contain the letter 'o' in the sentence.

Ex Output:

5