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

Ex Input:
Sentence: 'a person in the air on skis on a mountain slope'. How many words contain the letter 'w' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'there are trains that are on the train track'. How many words contain the letter 'z' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a young boy with an umbrella and backpack'. How many words contain the letter 'p' in the sentence.

Ex Output:

1