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

Ex Input:
Sentence: 'a fresh flower on a table in a piture of water'. How many words contain the letter 'n' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'people walking down the sidewalk with no turn signs'. How many words contain the letter 'e' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a photo taken from within a car of a small street in a rural town'. How many words contain the letter 'm' in the sentence.

Ex Output:

2