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

Ex Input:
Sentence: 'a living room with couches chairs and tables'. How many words contain the letter 'a' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'there is a person awaiting to cross this street'. How many words contain the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a small passenger plane flying on a sunny day'. How many words contain the letter 'p' in the sentence.

Ex Output:

2