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

Ex Input:
Sentence: 'a zebra is standing in the shallow water'. How many words contain the letter 't' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a black sign that is standing in the grass'. How many words contain the letter 'f' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a train is traveling down a track on a cloudy day'. How many words contain the letter 'i' in the sentence.

Ex Output:

3