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

Input: Consider Input: Sentence: 'a long train is coming down some tracks'. How many words contain the letter 'w' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'the jet is flying through the sky during the day'. How many words contain the letter 'i' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a cat laying on a white bed spread'. How many words contain the letter 'b' in the sentence.


Output: 1