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: 'the zebra is showing his rear end to the camera'. How many words contain the letter 'r' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a dog is standing on the floor near a mirror'. How many words contain the letter 'd' in the sentence.

Ex Output:

2