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

Ex Input:
Sentence: 'some people standing around a line of tennis courts'. How many words contain the letter 'c' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'people in different boats rowing around a lake'. How many words contain the letter 'b' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'toothbrushes a soap dish and other containers sitting on a table'. How many words contain the letter 'r' in the sentence.

Ex Output:

3