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

Ex Input:
Sentence: 'the zebra is showing his rear end to the camera'. How many words contain the letter 'r' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'people fly kites and relax at a crowded sunlit beach'. How many words contain the letter 'l' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a sign sitting next to a sidewalk with a garbage can traffic cone and several fire hydrants on it'. How many words contain the letter 'x' in the sentence.

Ex Output:

1