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

Input: Consider Input: Sentence: 'a black sign that is standing in the grass'. How many words contain the letter 'f' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'the train needs to be serviced so it is o the truck'. How many words contain the letter 'n' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a man watches as a woman hits him a tennis ball'. How many words contain the letter 'c' in the sentence.


Output: 1