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

Input: Consider Input: Sentence: 'street signs are affixed to a utility pole'. How many words contain the letter 'u' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a man sits on a bench with a dog in lap reading'. How many words contain the letter 'x' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'a tennis player holds a ball as if to throw it in the air to serve it'. How many words contain the letter 'o' in the sentence.


Output: 4