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

Ex Input:
Sentence: 'a gothic tower features a clock near a river'. How many words contain the letter 'e' in the sentence.

Ex Output:
4


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: 'an open box of pizza with toppings on a counter'. How many words contain the letter 'p' in the sentence.

Ex Output:

3