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

Ex Input:
Sentence: 'a man riding a snowboard down the side of a snow covered slope'. How many words contain the letter 'c' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'some brown and white goats and a man on some grass'. How many words contain the letter 'o' in the sentence.

Ex Output:
5


Ex Input:
Sentence: 'a group of people at the beach in the sand'. How many words contain the letter 'u' in the sentence.

Ex Output:

1