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

Sentence: 'a person that is wearing glasses looking into a mirror'. How many words contain the letter 'f' in the sentence.
0

Sentence: 'a large clock tower under a grey cloudy sky'. How many words contain the letter 'l' in the sentence.
3

Sentence: 'a radish on a cutting board next to a knife'. How many words contain the letter 'x' in the sentence.

1