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

Ex Input:
Sentence: 'a man herding brown colored animals with a dog'. How many words contain the letter 'z' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a picture of some horses and a person in the street'. How many words contain the letter 'r' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a bearded man eating a sandwich while riding in a vehicle'. How many words contain the letter 'r' in the sentence.

Ex Output:

2