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

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

Output: 2


Input: Consider Input: Sentence: 'cars parked on the side of the road beside a fire hydrant'. How many words contain the letter 'p' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a black and white photo of two laptops some pens and a mouse'. How many words contain the letter 'b' in the sentence.


Output: 1