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

Ex Input:
Sentence: 'there are trains that are on the train track'. How many words contain the letter 'z' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'some kids are all taking a photograph together'. How many words contain the letter 'e' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a wooden cart in a village area full of just picked bananas'. How many words contain the letter 's' in the sentence.

Ex Output:

2