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

Sentence: 'a person skiing down part of a marked race course'. How many words contain the letter 'z' in the sentence.
0

Sentence: 'the train needs to be serviced so it is o the truck'. How many words contain the letter 'n' in the sentence.
2

Sentence: 'two people walking through a snow storm under an umbrella'. How many words contain the letter 'u' in the sentence.

3