instruction:
In this task, you need to count the number of words in a sentence that contain the given letter
question:
Sentence: 'the tennis player returns a serve of the tennis ball'. How many words contain the letter 'q' in the sentence.
answer:
0


question:
Sentence: 'a man walking in front of a train station'. How many words contain the letter 'o' in the sentence.
answer:
3


question:
Sentence: 'a red and white stop sign some cars and a blue truck'. How many words contain the letter 'n' in the sentence.
answer:

3