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

Ex Input:
Sentence: 'a very big nice looking kitchen that is well lit'. How many words contain the letter 'r' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a glass vase with clear glass marbles in it and purple flowers coming out of the vase'. How many words contain the letter 'd' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a clock tower on an official building with an eagle on top'. How many words contain the letter 'u' in the sentence.

Ex Output:

1