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

Input: Consider Input: Sentence: 'child standing in front of a stop sign on a suburban street corner'. How many words contain the letter 'u' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a bunch of people in a big field filled with bananas'. How many words contain the letter 'r' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'a white stuffed bear sits on a yoga mat'. How many words contain the letter 'k' in the sentence.


Output: 0