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

Ex Input:
Sentence: 'a long train is coming down some tracks'. How many words contain the letter 'w' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'some brown and white goats and a man on some grass'. How many words contain the letter 'o' in the sentence.

Ex Output:
5


Ex Input:
Sentence: 'a bunch of cows is in a field while a train passes by'. How many words contain the letter 'm' in the sentence.

Ex Output:

0