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

Input: Consider Input: Sentence: 'adults with helmets sitting on tricycles made for children'. How many words contain the letter 'r' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a couple of zebras are standing in a pin'. How many words contain the letter 'a' in the sentence.

Output: 5


Input: Consider Input: Sentence: 'a man with a moustache is wearing a tie and has his arms crossed'. How many words contain the letter 'y' in the sentence.


Output: 0