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

Ex Input:
Sentence: 'a green blue and yellow boat sitting in a harbor'. How many words contain the letter 'o' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'the street corner is flooded deep with water'. How many words contain the letter 'f' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man on water skis prepares to jump the pole'. How many words contain the letter 'x' in the sentence.

Ex Output:

0