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

Input: Consider Input: Sentence: 'looking out a window at a tall building with a clock on the face'. How many words contain the letter 'l' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a person that is fixing a pillow on a couch'. How many words contain the letter 's' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'the group of people are sitting together eating'. How many words contain the letter 'u' in the sentence.


Output: 1