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

Ex Input:
Sentence: 'a line of portable toilets stands outdoors under trees'. How many words contain the letter 'l' in the sentence.

Ex Output:
3

Ex Input:
Sentence: 'young girls with backpacks are standing near stairs that look to go to the subway'. How many words contain the letter 'r' in the sentence.

Ex Output:
4

Ex Input:
Sentence: 'the flowers are being displayed in the dark room'. How many words contain the letter 'h' in the sentence.

Ex Output:
2