In this task, you need to count the number of words in a sentence that contain the given letter
--------
Question: Sentence: 'a man on a boat pets a dog in a life jacket'. How many words contain the letter 'b' in the sentence.

Answer: 1


Question: Sentence: 'this is a yellow train riding the rails'. How many words contain the letter 'n' in the sentence.

Answer: 2


Question: Sentence: 'a doll is on a desk with a banana'. How many words contain the letter 'l' in the sentence.

Answer:
1