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

Ex Input:
Sentence: 'a girl at a lake is looking at sand inside of a frisbee'. How many words contain the letter 'u' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a television is sitting on a table in a room'. How many words contain the letter 'g' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a slice of pizza melon chunks salad fries and ketchup on a plate'. How many words contain the letter 'x' in the sentence.

Ex Output:

0