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

Ex Input:
Sentence: 'a ram standing still in an empty pasture'. How many words contain the letter 'x' 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 big boat that is parked at the dock'. How many words contain the letter 's' in the sentence.

Ex Output:

1