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

Ex Input:
Sentence: 'a cat that is laying down with a mouse on top of it'. How many words contain the letter 'm' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'some stop lights that are at an intersection'. How many words contain the letter 'c' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'picture of bottom of jacket with stethescope poking out from underneath'. How many words contain the letter 's' in the sentence.

Ex Output:

1