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: 'three birds perched on top of a wire fence'. How many words contain the letter 'b' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a beautiful street in a european city scape'. How many words contain the letter 'y' in the sentence.

Ex Output:

1