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

Ex Input:
Sentence: 'two giraffe a mom and baby both with their heads up'. How many words contain the letter 'w' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a woman swinging a tennis racquet in the air'. How many words contain the letter 'z' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'two surfboards on a beach in an urban setting'. How many words contain the letter 'a' in the sentence.

Ex Output:

5