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

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

Ex Output:
2


Ex Input:
Sentence: 'a couple of zebras are standing in a pin'. How many words contain the letter 'a' in the sentence.

Ex Output:
5


Ex Input:
Sentence: 'a kitten sitting beside a remote control glances upward'. How many words contain the letter 'j' in the sentence.

Ex Output:

0