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

Ex Input:
Sentence: 'a boy is doing a trick with his skateboard'. How many words contain the letter 'y' in the sentence.

Ex Output:
1


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 bunch of sailboats that are in the water'. How many words contain the letter 'r' in the sentence.

Ex Output:

2