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

Ex Input:
Sentence: 'a little baby boy wearing an vest and tie'. How many words contain the letter 'e' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'several people sitting around a table eating pizza'. How many words contain the letter 'u' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'there is a man and a woman playing on the same team in tennis'. How many words contain the letter 's' in the sentence.

Ex Output:

3