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

Sentence: 'child standing in front of a stop sign on a suburban street corner'. How many words contain the letter 'u' in the sentence.
1

Sentence: 'a man in a suit with his finger in his ear'. How many words contain the letter 'm' in the sentence.
1

Sentence: 'there is a man interacting with a black dog'. How many words contain the letter 'r' in the sentence.

2