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

Ex Input:
Sentence: 'a train that is pulling into the station'. How many words contain the letter 't' in the sentence.

Ex Output:
5

Ex Input:
Sentence: 'a large airplane flying over a dry grass hillside'. How many words contain the letter 'e' in the sentence.

Ex Output:
4

Ex Input:
Sentence: 'a brown dog is laying un the floor under peoples feet'. How many words contain the letter 'a' in the sentence.

Ex Output:
2