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

Ex Input:
Sentence: 'a fresh flower on a table in a piture of water'. How many words contain the letter 'n' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a panthers football player holding a baseball bat and basketball'. How many words contain the letter 'y' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'two people one riding a horse while the other look on'. How many words contain the letter 'y' in the sentence.

Ex Output:

0