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

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 gothic tower features a clock near a river'. How many words contain the letter 'e' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'the woman is happy to get her birthday cake'. How many words contain the letter 'r' in the sentence.


Output: 2