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 close up of two black cows grazing the grass'. How many words contain the letter 'u' in the sentence.

Output: 1


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