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

Ex Input:
Sentence: 'a person standing in line for food at a food truck'. How many words contain the letter 'c' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a close up of two black cows grazing the grass'. How many words contain the letter 'u' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a family standing on a beach looking over the water while one sets up a large umbrella'. How many words contain the letter 'r' in the sentence.

Ex Output:

4