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

Ex Input:
Sentence: 'a red and green fire hydrant in son a sidewalk'. How many words contain the letter 'm' in the sentence.

Ex Output:
0


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

Ex Output:
4


Ex Input:
Sentence: 'a small child plays bowling on the nintendo wii'. How many words contain the letter 'n' in the sentence.

Ex Output:

3