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

Ex Input:
Sentence: 'person standing in the grass striking a baseball with a bat'. How many words contain the letter 's' in the sentence.

Ex Output:
5


Ex Input:
Sentence: 'a man and a woman sitting in the backseat as the woman talks on a cell phone'. How many words contain the letter 's' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'giraffe begging for food from a man and child at a tourist viewing area'. How many words contain the letter 'm' in the sentence.

Ex Output:

2