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

Ex Input:
Sentence: 'a man with a skateboard up in air at a skateboard park'. How many words contain the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'horses standing and laying down in the grass on a hill above a lake'. How many words contain the letter 'g' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a bathroom with two sinks and a large mirror'. How many words contain the letter 'r' in the sentence.

Ex Output:

3