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

Input: Consider Input: Sentence: 'several people and a dog riding on a small boat'. How many words contain the letter 'l' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'there is a red tea pot that has flowers in it'. How many words contain the letter 'o' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a man is surfing in the ocean with a green surfboard'. How many words contain the letter 'k' in the sentence.


Output: 0