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

Ex Input:
Sentence: 'a pair of tennis players on a tennis court'. How many words contain the letter 'u' in the sentence.

Ex Output:
1

Ex Input:
Sentence: 'an older fighter plan sitting next to a group military men'. How many words contain the letter 'y' in the sentence.

Ex Output:
1

Ex Input:
Sentence: 'three young people are playing frisbee on a soccer field'. How many words contain the letter 'u' in the sentence.

Ex Output:
1