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

Ex Input:
Sentence: 'a grown elephant with two baby elephants standing in tall grasses'. How many words contain the letter 'w' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'two stuffed pandas near a small shack near a body of water'. How many words contain the letter 'g' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a little boy sitting in a chair with a big white teddy bear'. How many words contain the letter 'r' in the sentence.

Ex Output:

2