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

Ex Input:
Sentence: 'an asian man ad woman on their cell phones'. How many words contain the letter 'i' in the sentence.

Ex Output:
2

Ex Input:
Sentence: 'a laptop computer that is sitting on a desk'. How many words contain the letter 't' in the sentence.

Ex Output:
4

Ex Input:
Sentence: 'there are many people and having some fun'. How many words contain the letter 'r' in the sentence.

Ex Output:
2