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

Sentence: 'a man flying through the air while riding a snowboard'. How many words contain the letter 'x' in the sentence.
0

Sentence: 'a large brown dog with a white deflated ball in its mouth'. How many words contain the letter 'm' in the sentence.
1

Sentence: 'clothing and personal items have been unpacked from a backpack'. How many words contain the letter 's' in the sentence.

2