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

Ex Input:
Sentence: 'a man in a white turban drives a motorcycle along a dirty road'. How many words contain the letter 'd' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a man on a boat pets a dog in a life jacket'. How many words contain the letter 'b' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'someone is taking a piece of pizza that is topped with vegetables and lots of cheese'. How many words contain the letter 'r' in the sentence.

Ex Output:

0