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

Ex Input:
Sentence: 'a big sign that is lit up near some buildings'. How many words contain the letter 'r' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'an orange cat is lounging on a gray couch'. How many words contain the letter 'c' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man is standing on a bench on the dock'. How many words contain the letter 's' in the sentence.

Ex Output:

2