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

Sentence: 'four white and blue street signs on a wooden pole'. How many words contain the letter 'u' in the sentence.
2

Sentence: 'a ram standing still in an empty pasture'. How many words contain the letter 'x' in the sentence.
0

Sentence: 'a man riding a skateboard down a ramp'. How many words contain the letter 'a' in the sentence.

6