instruction:
In this task, you need to count the number of words in a sentence that contain the given letter
question:
Sentence: 'many people are playing a sports video game while standing up'. How many words contain the letter 'l' in the sentence.
answer:
3


question:
Sentence: 'a business man is talking on the phone'. How many words contain the letter 'e' in the sentence.
answer:
3


question:
Sentence: 'a wooden bench on the side of a trail has a backpack left on it'. How many words contain the letter 'r' in the sentence.
answer:

1