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

Ex Input:
Sentence: 'a young man dressed as a nun skateboards down the street'. How many words contain the letter 'e' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'unusual round vase with flower stems inside it'. How many words contain the letter 'c' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a pair of giraffe are walking in a field in africa'. How many words contain the letter 'm' in the sentence.

Ex Output:

0