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

Ex Input:
Sentence: 'trash cans and a fire hydrant are on the curb of a sidewalk'. How many words contain the letter 'u' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a clothing line with teddy bears hung by their ears'. How many words contain the letter 'n' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a messy hotel room with the closet light on and tv playing'. How many words contain the letter 'o' in the sentence.

Ex Output:

4