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

Input: Consider Input: Sentence: 'people standing in a river surrounding an elephant some are touching it'. How many words contain the letter 'd' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a plate with a grilled sanwich next to a bowl of tomato soup'. How many words contain the letter 'a' in the sentence.

Output: 6


Input: Consider Input: Sentence: 'a man is playing a physical game in a living room'. How many words contain the letter 'n' in the sentence.


Output: 4