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

Ex Input:
Sentence: 'a person in uniform is on a motorcycle near other uniformed people'. How many words contain the letter 'r' in the sentence.

Ex Output:
6


Ex Input:
Sentence: 'a cat that is laying down with a mouse on top of it'. How many words contain the letter 'm' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a group of giraffes walk through some brush'. How many words contain the letter 'g' in the sentence.

Ex Output:

3