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

Ex Input:
Sentence: 'many people are playing a sports video game while standing up'. How many words contain the letter 'l' in the sentence.

Ex Output:
3

Ex Input:
Sentence: 'a man is holding a bunch of green bananas in his yard'. How many words contain the letter 'i' in the sentence.

Ex Output:
4

Ex Input:
Sentence: 'an array of exotic food is next to a hand'. How many words contain the letter 'n' in the sentence.

Ex Output:
3