instruction:
In this task, you need to count the number of words in a sentence that contain the given letter
question:
Sentence: 'people standing in a river surrounding an elephant some are touching it'. How many words contain the letter 'd' in the sentence.
answer:
2


question:
Sentence: 'a airplane is seen at the airport with other airplanes'. How many words contain the letter 'z' in the sentence.
answer:
0


question:
Sentence: 'child standing in front of a stop sign on a suburban street corner'. How many words contain the letter 'u' in the sentence.
answer:

1