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

Ex Input:
Sentence: 'a computer desk holding a laptop computer and white ceramic lamp'. How many words contain the letter 'r' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'an older fighter plan sitting next to a group military men'. How many words contain the letter 'y' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a group of zebras and a few wildebeest on the savannah'. How many words contain the letter 's' in the sentence.

Ex Output:

3