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

Input: Consider Input: Sentence: 'a very cute white dog standing by a table with food'. How many words contain the letter 'o' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a person is riding a bicycle on the street'. How many words contain the letter 'b' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a large boat sails across the open water'. How many words contain the letter 'b' in the sentence.


Output: 1